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Waters Network Systems

User’s Manual

Page 69

GSM-2116 and GSM-2124

Figure 5.42 – MAC Alias

Parameter description:

MAC Address:

Six-byte Ethernet hardware address and usually expressed by hex and separated by hyphens.
For example,

00 – 40 - C7 - D6 – 00 - 01

Alias:

MAC alias name you assign.

Note:

If there are too many learned MAC addresses, it is recommended to input the MAC address and

alias name directly.

Содержание GSM 2124

Страница 1: ...s for 1000Base SX or LX fiber CORPORATE HEADQUATERS MANUFACTURING CUSTOMER SERVICE 5001 American Blvd W Suite 605 945 37 th Avenue NW Bloomington MN 55437 Rochester MN 55901 Phone 800 441 5319 Phone 8...

Страница 2: ...NAGEMENT 22 5 2 SYSTEM INFORMATION 25 5 3 IP CONFIGURATION 26 5 4 TIME CONFIGURATION 28 5 5 ACCOUNT CONFIGURATION 30 5 6 MANAGEMENT POLICY 31 5 7 VIRTUAL STACK 33 5 8 PORT CONFIGURATION 35 5 8 1 PORT...

Страница 3: ...24 DIAGNOSTICS 99 5 25 TFTP SERVER 101 5 26 LOG DATA 102 5 27 FIRMWARE UPGRADE 103 5 28 REBOOT 104 5 29 LOGOUT 105 6 0 OPERATION OF CLI MANAGEMENT 106 6 1 LOGIN 106 6 2 COMMANDS OF CLI 107 7 0 MAINTEN...

Страница 4: ...DIX Back pressure flow control for half duplex Flow control for full duplex MANAGEMENT FUNCTIONS Web based SNMP v1 v2c CLI or Telnet Port setting for duplex and speed Port trunking groups Port based a...

Страница 5: ...tors POWER SUPPLY Internal power supply Input Voltage 100 to 240 VAC 50 to 60Hz Power Consumption 30 watts maximum OPERATING ENVIRONMENT Ambient Temperature 32 to 122 F 0 to 50 C Ambient Humidity All...

Страница 6: ...ns such as QoS Quality of Service Spanning Tree VLAN Port Trunking Bandwidth Control Port Security SNMP RMON IGMP Snooping capability via the intelligent software The switch is suitable for both metro...

Страница 7: ...e system information upon login Supports static trunk function Supports 802 1Q VLAN Three user login Maximum packet length can be up to 9216 bytes for jumbo frame application Supports DHCP broadcastin...

Страница 8: ...witch The LEDs located on the left side of the front panel contains a power LED indicating the power status and the status of the eight working ports on the switch Figure 3 1 GSM 2116 Switch Figure 3...

Страница 9: ...Port 15 16 or 23 24 LED SFP LINK ACT Green Lit when connection with the remote device is good Blinks when any traffic is present Off when module connection is not good Table 3 1 3 4 Rear Panel Located...

Страница 10: ...ct module and conforms to the chassis 2 Slide the module along the slot 3 Seat the module against the slot socket connector 4 Install the proper cable for network connection 3 8 Power On Once the swit...

Страница 11: ...r and client station Basically with this approach it will minimize the number of switches in any one path will lower the possibility of network loop and will improve network efficiency If more than tw...

Страница 12: ...re 3 6 This is an example of how VLANs can be set up between two switches 1 VLAN1 members cannot access VLAN2 VLAN3 and VLAN4 members 2 VLAN2 members cannot access VLAN1 and VLAN3 members but they can...

Страница 13: ...al Port Connection To configure the switch via the RS 232 serial port connection follow these steps 1 Connect the serial cable included with your switch to your workstation 2 Connect the serial cable...

Страница 14: ...tch via the console connection you will have to use the CLI command listed below A complete list of CLI commands is in Section 6 0 of this manual 1 Once you have logged into the switch you will see th...

Страница 15: ...me Before you are able to communicate with the switch you must know the IP address of the switch Once you know the IP address follow these instructions 1 Connect the switch with a UTP cable to your wo...

Страница 16: ...etwork identifier address and host identifier address The network identifier identifies the network on which the host resides while the host identifier identifies the particular host on the given netw...

Страница 17: ...ddress There are 2 097 152 2 21 24 networks able to be defined with a maximum of 254 2 8 2 hosts per network 110 Class D and E Class D is a class with first 4 MSB most significance bit set to 1 1 1 0...

Страница 18: ...55 255 0 in which each bit of the first three bytes is 1 It s now clear that the first two bytes is used to identify the class B network the third byte is used to identify the subnet within this class...

Страница 19: ...work IP address which may look like 168 1 2 0 With the subnet mask a bigger network can be divided into smaller pieces If you want to have more than two independent networks in a LAN the network must...

Страница 20: ...hown in the Figure 4 4 enter 255 255 255 0 Any subnet mask such as 255 255 255 x is allowable in this case DNS The Domain Name Server translates the human readable machine name to IP address Every mac...

Страница 21: ...admin Click on the Login button The login process now is completed If you forget the password click the link Forget Password in WebUI See Figure 5 1 or input Ctrl Z in from the CLI s login screen The...

Страница 22: ...the function tree for all of the management functions is displayed We will explore these functions in this chapter The following information is listed on the opening screen Model System Description Lo...

Страница 23: ...o view information about the switch This is a very convenient function for browsing the information for a single port To view a single port click on the port and an information window will be displaye...

Страница 24: ...menu tree for the web functions This a hierarchical menu When you make a selection a sub menu may be displayed with additional function in the sub menu The functions of each folder are described in th...

Страница 25: ...ame of the switch User defined Default is GEL2 SW16 or GS 2124C System up time The time accumulated since this switch was powered up The format is day hour minute and second Current time Show the syst...

Страница 26: ...IP Configuration Function description Set IP address subnet mask default gateway and DNS for the switch Parameter description DHCP Setting DHCP is the abbreviation of Dynamic Host Configuration Protoc...

Страница 27: ...e which should be the same value as that of the other devices resided in the same network it attaches Default gateway Set an IP address for a gateway to handle those packets that do not meet the routi...

Страница 28: ...te and Second are 2000 1 12 1 31 0 23 0 59 and 0 59 respectively Input the wrong figure and press the Apply button the device will reject the time adjustment request There is no time zone setting in M...

Страница 29: ...to set the starting ending date as well otherwise the daylight saving function will not be activated Default for Daylight Saving 0 The following parameters are configurable for the function Daylight...

Страница 30: ...Guest equivalent identity can modify his password only Please note that you must confirm administrator guest identity in the field of Authorization in advance before configuring the username and pass...

Страница 31: ...th accept and deny lists exist all connections will be denied except the connection inside the accepting range Accept Deny Deny Deny Accept __________________________________________________ Rule 5 If...

Страница 32: ...ange is 0 0 0 0 255 255 255 255 Incoming Port The switch supports two options for managed valid Port Range including Any and Custom The default is Any Custom allows you to select the ports that should...

Страница 33: ...without logging into these devices The top left button is only for Master device See Figure 3 9 The background color of the button you press will be changed to represent that the device is under your...

Страница 34: ...activation of VSM Default is Enable Role The role that the switch would like to play in virtual stack Two types of roles including master and slave are offered The default is Master Group ID It is the...

Страница 35: ...ation status speed duplex and flow control If a fiber module is installed in one or both of the slots the current status for those ports will be displayed See Figure 5 10 Figure 5 10 Current Port Stat...

Страница 36: ...igured by user Default Enabled Auto Negotiation Displays the exchange mode of Ethernet MAC There are two modes supported in the switch They are auto negotiation mode Enabled and forced mode Disabled W...

Страница 37: ...length for instance 850nm 1310nm 1550nm and so on Baud Rate Displays the maximum baud rate of the fiber module supported for instance 10M 100M 1G and so on Vendor OUI Displays the manufacturer s OUI c...

Страница 38: ...ceiver power of SFP module 5 8 2 Port Configuration Port Configuration is used to modify the setting by port This function allows set and reset the functions described below Figure 5 12 Port Configura...

Страница 39: ...here is no default value In forced mode the default value depends on the setting Flow Control There are two modes to choose in flow control including Enable and Disable If flow control is set to Enabl...

Страница 40: ...umber of collisions transmitting frames experienced Rx Error Packet Number of bad packets received 5 8 4 Detail Counter The function of the Detail Counter is to collect information and provide the cou...

Страница 41: ...ority Rx Low Priority Packets Number of Rx packets classified as low priority Rx Broadcast Shows the counting number of the received broadcast packet Rx Multicast Shows the counting number of the rece...

Страница 42: ...packets transmitted Tx 256 511 Bytes Number of 256 511 byte frames in good and bad packets transmitted Tx 512 1023 Bytes Number of 512 1023 byte frames in good and bad packets transmitted Tx 1024 Byt...

Страница 43: ...itoring Port and Monitored Port respectively the traffic received by Port B will be copied to Port A for monitoring Note When configuring the mirror function it is recommended to avoid setting a port...

Страница 44: ...Policing Set up the limit of Ingress bandwidth for the port you chose Incoming traffic will be discarded if the rate exceeds the value you set up in Data Rate field Pause frames are also generated if...

Страница 45: ...and then choose Default Class as High the priority of the packets with no tag will be considered as High priority The initial value of the Default Class is High Figure 5 17 QoS Configuration Function...

Страница 46: ...LAN tagged priority 0 0 1 to Low Priority and then include ports 1 2 3 in VLAN 2 that means the packets that have the value 0 0 0 in VLAN tagged field and VID equals two from Port 2 and the packets th...

Страница 47: ...bits we could arrange eight traffics 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 As long as we change bit 5 7 of TOS field of IP header we will create the eight traffic packets High priority or Lo...

Страница 48: ...ize iSCSI Belongs to the QoS in L4 Select the option button and click Apply Click Advance to set special TCP UDP port for QoS Prioritize web browsing e mail FTP transfers and news Belong to the QoS in...

Страница 49: ...l Special UDP TCP Port Selection The following are port numbers defined by the following specific networks in L4 Down prioritize web browsing e mail FTP and news o port number 80 280 443 25 110 20 21...

Страница 50: ...t six bits comprise a codepoint which is sometimes abbreviated DSCP and the last two bits are left unused IP Diffserve Classification function can form total 64 0 63 kinds of Traffic Class based on th...

Страница 51: ...rs will be ignored Function name SNMP Configuration Function description This function is used to configure SNMP settings community name trap host and public traps as well as the throttle of SNMP A SN...

Страница 52: ...to create a trap manager by assigning an IP address to the host the trap message In other words the trap host is a network management unit with SNMP manager receiving the trap message from a switch wi...

Страница 53: ...e the information of the multicast table when a member port joins or leaves an IP multicast destination address With this function once a switch receives an IP multicast packet it will forward the pac...

Страница 54: ...s device VLAN ID Shows VLAN ID for each multicast group Member Port Shows member ports that join each multicast group Function name Allowed Group Function description The Allowed Group function allows...

Страница 55: ...be modified by using Edit Delete Remove the existed entry of allowed group configuration from the allowed group 5 14 Maximum Packet Length Function name Max Packet Length Function description The swit...

Страница 56: ...set randomly ranging from 0 to 30 seconds The exact delay time is computed by the switch itself The default is Disable Figure 5 28 DHCP Boot 5 16 VLANs The switch supports Tag based VLAN 802 1q and P...

Страница 57: ...creened with filtering criteria to determine if it can be forwarded The switch supports 802 1q Each tag based VLAN must be assigned a VLAN name and VLAN ID Valid VLAN ID is 1 4094 You may create total...

Страница 58: ...description Displays tag based VLAN groups Use this option to create edit and delete a tag based VLAN groups Add a new VLAN group by inputting a new VLAN name and VLAN ID Parameter description VLAN Na...

Страница 59: ...ure 5 31 Tag Based Group Add Group Create a new Tag based VLAN Input the VLAN name and the VID Configure the SYM VLAN function and choose the member by selecting the check box beside the port number P...

Страница 60: ...Based Group Function name Port based Group Configuration Function description Displays the information for the existing port based VLAN groups Use this function to create edit and delete a port based...

Страница 61: ...d Group Create a new port based VLAN Input the VLAN name and choose the group member by selecting the check box beside the port number Select Apply so the setting will take effect Figure 5 35 Port bas...

Страница 62: ...1 Forward only packets with VID matching this port s configured VID Ingress Filtering Rule 2 Drop untagged frame Select the role of each port as Access Trunk or Hybrid Parameter description Port 1 16...

Страница 63: ...packet The packet then will be forwarded But if the PVID of port 1 is 100 and port 1 is not member of VLAN 100 the packet will be dropped Role This is an egress rule of the port You can choose Access...

Страница 64: ...from the searched MAC entries table Alias Set up the Alias for the selected MAC entry Set Alias Save the Alias of MAC entry you set up Search Find the entry that meets your setup Previous Page Move to...

Страница 65: ...t time will be removed from the MAC Table The range of age out time is 10 65535 seconds and the setup of this time will have no effect on static MAC addresses Parameter description Aging Time Deletes...

Страница 66: ...is assigned to a specific port all of the switch s traffic is sent to this MAC address will be forwarded to this port For adding a MAC address entry in the allowed table fill in four parameters MAC ad...

Страница 67: ...listed in the filtering Static Filter table Maintain the table by filling in MAC Address VID VLAN ID and Alias fields individually You can delete the entry by using Delete Parameter description MAC S...

Страница 68: ...d MAC Alias Edit and MAC Alias Delete Use Create Edit to add modify a new or an existing alias name for a specified MAC address or mark an existing entry for deletion Alias name must be composed of A...

Страница 69: ...ter description MAC Address Six byte Ethernet hardware address and usually expressed by hex and separated by hyphens For example 00 40 C7 D6 00 01 Alias MAC alias name you assign Note If there are too...

Страница 70: ...es to setup and update their knowledge database the set of VLANs associated with currently active members and through which ports these members can be reached The following three functions are support...

Страница 71: ...ontrol value normal registrar fixed registrar and forbidden registrar Normal The Registrar responds normally to incoming GARP messages The default setting is Normal Fixed The Registrar ignores all GAR...

Страница 72: ...lication JoinEmpty Message Packets Number of GARP BPDU with Join Empty message received by the GARP application JoinIn Message Packets Number of GARP BPDU with Join In message received by the GARP app...

Страница 73: ...ion Empty Message Packets Number of GARP BPDU with Empty message transmitted by the GARP application Function name GVRP Group Information Function description To show the dynamic group member and thei...

Страница 74: ...e active path on the network 5 19 1 STP Status Function name STP Status Function description Spanning Tree Status displays the current status of 12 parameters The 12 parameters are described below Par...

Страница 75: ...is defined as the time spent from Listening state moved to Learning state or from Learning state moved to Forwarding state of a port in bridge Hello Time Displays the current hello time of the root b...

Страница 76: ...ime assigned by this switch to communicate with each other The valid value is 1 10 in unit of second Default is 2 seconds Max Age When the GSM switch is the root bridge the whole LAN will apply the nu...

Страница 77: ...02 1w specification DISCARDING state indicates that this port can neither forward packets nor contribute learning knowledge LEARNING state indicates this port can now contribute its learning knowledge...

Страница 78: ...dge port toggles the STP topology keeps unchanged Unlike the designate port or root port though an edge port will transit to a normal spanning tree port immediately if it receives a BPDU Default No Ad...

Страница 79: ...cation as their trunking method can choose their unique LACP GroupID 1 8 to form a logic trunked port The benefit of using LACP is that a port makes an agreement with its peer port before it becomes a...

Страница 80: ...ady used Static Trunk Group ID 1 the 13th port willing to use the same Static Trunk Group ID will be automatically set to use the None trunking method and its Group ID will turn to 0 This means the po...

Страница 81: ...ive of a trunking group Ports with same Group ID and using same trunking method will have the opportunity to aggregate to a particular aggregator port This aggregator port is usually the port with the...

Страница 82: ...0 Aggregator View Function name LACP Detail LACP Aggregator Detailed Information Function description Displays the detailed information of the LACP trunking group Parameter description Actor The switc...

Страница 83: ...ction description Used to set the priority of the LACP system ID LACP will only aggregate together the ports whose peer link partners are all on a single system Each system supports LACP will be assig...

Страница 84: ...authorized or unauthorized according to the result of authentication message exchanged between it and a supplicant PAE The authenticator may request the supplicant to re authenticate itself at a conf...

Страница 85: ...ge with the authenticator on the port it connected via EAPOL packet The authenticator transfers the supplicant s credentials to Authentication server for verification If successful the authentication...

Страница 86: ...ting user password via the authenticator PAE 7 The supplicant will convert the user password into the credential information perhaps in MD5 format and replies an EAP Response with this credential info...

Страница 87: ...us the status of port mode set in 802 1X Port mode port control state set in 802 1X port setting Entry Authorized means MAC entry is authorized Port Mode Port Control Authentication Port Status Disabl...

Страница 88: ...ort number to communicate with RADIUS server for the authentication service The valid value ranges 1 65535 Default port number is 1812 Secret Key The secret key between authentication server and authe...

Страница 89: ...authorized Figure 5 57 802 1X Mode Setting Function name Port Security Management Function description Displays each port status In multihost mode the port number and its status authorized or unauthor...

Страница 90: ...t in 802 1X port security application Refer to the following parameters description for details Parameter description Port The port number to be selected for configuring its associated 802 1X paramete...

Страница 91: ...ion will take place in this port Default ON reAuthPeriod 1 65535 s A non zero number seconds between the periodic re authentication of the supplicant Default 3600 max Request 1 10 The maximum of numbe...

Страница 92: ...Waters Network Systems User s Manual Page 92 GSM 2116 and GSM 2124 Figure 5 59 Port Parameter Setting...

Страница 93: ...ap The message will be sent if you check the trap event individually on the web page shown below Parameter description Trap Cold Start Warm Start Link Down Link Up Authentication Failure User login Us...

Страница 94: ...p event occurs Once trap events have been selected enter your desired email addresses and mobile phone numbers Select Apply to complete the alarm configuration The alarm settings will take effect in a...

Страница 95: ...tion before rebooting the switch Default Configuration The factory setting and cannot be altered Working Configuration The working configuration is the current configuration and can be changed any tim...

Страница 96: ...rent configuration as a start configuration file in flash memory Figure 5 63 Configuration Screen Function name Save As User Configuration Function description Save the current configuration as a user...

Страница 97: ...itch will be restored to 192 168 1 1 Figure 5 65 Restore Configuration Function name Restore Default Configuration excludes current IP address Function description Restore Default Configuration functi...

Страница 98: ...s after rebooting the system Figure 5 67 Restore User Configuration 5 23 2 Configuration File Function name Config File Function description Use this function to back up or reload the configuration fi...

Страница 99: ...available for device self diagnostics Each of them will be described in detail in the following sections Function name Diagnostics Function description Diagnostics provides a set of basic system diagn...

Страница 100: ...side the switch box The test signal only wraps around in the switch The second function will send the test signal to its link partner If the switch is not connected to active network devices i e the p...

Страница 101: ...ng After a few seconds the switch will report to the pinged device the result of the Ping Parameter description IP Address An IP address with the version of v4 e g 192 168 1 1 Default Gateway IP addre...

Страница 102: ...trap logs The switch supports a total 120 log entries For more details on log items please refer to Section 5 22 for Trap Alarm Configuration and SNMP Configuration Function name Log Data Function de...

Страница 103: ...Function name Firmware Upgrade Function description The switch supports software upgrade through a TFTP server To apply a firmware upgrade follow this procedures 1 Specify the IP address TFTP server 2...

Страница 104: ...software changing IP configuration or modifying VLAN configurations you must reboot in order for the new configuration to take effect Function name Reboot Function description Reboot the switch Reboot...

Страница 105: ...lly Function name Logout Function description The switch provides and automatic logout to prevent unauthorized users from using the system If you do not logout and exit the browser the switch will aut...

Страница 106: ...direct serial connection to the device or a Telnet session The default login identification is Username admin Password admin After you login successfully the prompt will be shown as if you are the fir...

Страница 107: ...lt Restore user Command instructions residing in the corresponding modes are local commands The same commands can be used in different modes and will perform a different function resulting in totally...

Страница 108: ...n prompt None None Restore Default restore default Use this command to restore the startup configuration provided by factory default If the restore is successful you will be prompted to reboot Once re...

Страница 109: ...ch port 0 ForceUnauthorized 1 ForceAuthorized 2 Auto port range 1 to 16 24 authorized 0 1 or 2 Set quiet period set quiet period port range sec This command is used to define periods of time when the...

Страница 110: ...vided by the Backend Authentication state machine to determine timeout conditions in the exchanges between the Authenticator and the Supplicant or Authentication Server The initial value is either sup...

Страница 111: ...name None Set user set user username Used to set up the account for the email server username email server account and password None Show Show Used to display email configuration None None email Del...

Страница 112: ...tologout time range 1 to 3600 seconds 0 for autologout OFF default setting is 180 seconds time 1 1 3600 Bandwidth Disable egress rate disable egress rate range Used to cancel the egress rate of the po...

Страница 113: ...p boot set dhcp boot sec Used to set the delay time for DHCP boot sec range syntax 0 1 30 the value o is used to disable DHCP boot delay sec 0 30 Show show Used to display the status of DHCP boot None...

Страница 114: ...ar as fixed mode forbidden set registrar as forbidden mode range 1 to 16 24 normal fixed forbidden nor mal or fixed or forbidden Set restricted set restricted range enable disable Used to set the rest...

Страница 115: ...r auto Set DNS set dns Used to set the IP address of the DNS server ip dns ip address 168 95 1 1 Set IP set ip mask gateway Used to set the system IP address subnet mask and gateway ip ip address mask...

Страница 116: ...care 0 as untagged port 1 to 16 24 vid 0 1 4094 show show Used to display all MAC table information None None maintain Set aging set aging Used to set up the age out time of dynamic learning MAC age...

Страница 117: ...value Access type action value a ccept or d eny name value No default must be set vid value Range is 1 4095 and can be set to any ip value Any valid IP address port value 1 or 1 8 type value h ttp s n...

Страница 118: ...port range Used to set the port that will be monitored The packets received by this port will be copied to the monitoring port range the port that is chosen for monitored port for the mirror function...

Страница 119: ...ull range 1 to 16 24 port speed auto 10half 10full 100half 100full 1Gfull Show conf show conf Used to display each port s configuration regarding state speed duplex and flow control None None Show det...

Страница 120: ...tos classification diffserv ip diffserv classification Port pri_tag tos layer4 diffserv Set port range class set port range class Used to set class of ports on port based QoS range port range syntax...

Страница 121: ...able set ability disable snmp Disable used in this mode will deactivate SNMP or set community None None Enable enable set ability enable snmp Enable used in this mode will activate SNMP or set communi...

Страница 122: ...16 24 path cost 0 1 200000000 priority 0 to 240 edge_port Admin Edge Port yes no admin p2p Set version set version stp rstp Used to set up the version of STP stp rstp stp rstp stp rstp stp tstp Show c...

Страница 123: ...h 01 12 DD Day 01 31 hh Hour 00 23 mm minute 00 59 ss second 00 59 YYYY 2000 2036 MM 01 12 DD 01 31 hh 00 23 mm 00 59 ss 00 59 Set ntp set ntp ip timezone Used to set the current time via the NTP serv...

Страница 124: ...ame Del tag group del tag group Used to delete the tag based VLAN group vid VLAN group to be deleted vid 1 to 4094 Disable drop untag disable drop untag range Used to set untagged frames to not be dro...

Страница 125: ...set the PVID of the VLAN range ports to be set PVID s 1 5 7 available from 1 to 16 24 pvid PVIDs to be set available 1 to 4094 range 1 to 16 24 pvid 1 to 4094 Set tag group set tag group vid name rang...

Страница 126: ...k Systems User s Manual Page 126 GSM 2116 and GSM 2124 Command Syntax Description Argument Possible Value master slave act as slave slave Show show Used to display the configuration of the virtual sta...

Страница 127: ...s connection b The network configuration of Computer C may be faulty Verify the network configuration on Computer C 2 The uplink connection function fails to work a Please check the uplink setup of th...

Страница 128: ...ensure that they have been properly connected and the cables wires have not been crimped or in some way impaired during installation About 90 of network downtime can be attributed to wiring and connec...

Страница 129: ...est and evaluate all returned products will repair products that are under warranty at no charge and will return the warranty repaired units to the sender with shipping charges prepaid see Warranty In...

Страница 130: ...Waters Network Systems User s Manual Page 130 GSM 2116 and GSM 2124 Waters Network Systems Attention Customer Service 945 37th Avenue NW Rochester MN 55901...

Страница 131: ...tems Repaired or replaced products will be returned at no cost to the original Buyer and shipped via the carrier and method of delivery chosen by Waters Network Systems Specific warranty by product fa...

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