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ARP proxy & VLAN
General description
ARP proxy
(Router mode only)
When a remote device connected over a Router-mode RipEX network does not support routing
(i.e. the default gateway cannot be configured), the narrowest possible subnet should be con-
figured on the respective Eth interface of the RipEX connected to it and the ARP proxy switched
on. The RipEX then answers ARP requests for all IP addresses routed to its radio interface.
Corresponding settings can be used in the RipEX connected to the central application device,
thus enabling the routed RipEX network to act as a direct (V)LAN connection for such devices.
WARNING:
Whenever there is more than one IP device connected to a RipEX, or even more RipEXes
connected to the same physical Eth,
the
ARP proxy must be used with the utmost care!
Subnets routed to the radio interface must be reduced to the minimum necessary, default
gateway should never be used. Accidental unwanted ARP responses may
destroy all commu-
nication
in the connected LAN!
VLAN
Unlimited number of VLANs can be set, but only for the ETH interface, not for the Radio one.
VLAN is defined by VLAN ID and IP and Mask. Several different Subnets can be assigned to a
VLAN. Each VLAN may be seen as a virtual ETH0.VLAN_ID interface. In addition to setting
multiple VLANs, the original ETH0 interface may be left non-VLAN, i.e. for receiving/transmitting
frames without a VLAN tag.
Router mode
When ARP proxy&VLAN is On, the RipEX Eth interface can receive/transmit also frames
with the respective VLAN IDs. Upon receiving a frame, the VLAN tag is stripped and the IP
packet continues through the RipEX network according to the routing table rules. When a
packet is routed to be transmitted over one of the virtual Eth interfaces, the respective VLAN
tag is added to the frame.
NOTE 1: Since the VLAN ID added to a packet/frame transmitted from Eth interface depends
solely on the local RipEX configuration (Routing table and VLAN), it is independent of the
original VLAN ID which has been stripped off upon the packet entry into the first RipEX.
Remember to double-check your configuration to avoid VLAN ID mismatching.
NOTE 2: When in Router mode, no Subnet on Ethernet may overlap with a Subnet on Radio
interface. Subnets on Ethernet could overlap each other (they may not be identical). For the
sake of clarity, we nevertheless recommend IP subnets for different VLANs to be set without
any overlapping.
Bridge mode
RipEX Radio modem & Router – © RACOM s.r.o.
140
Advanced Configuration
Содержание RipEX
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Страница 42: ... DQ Data Quality Min 180 PER Packet Error Rate Max 5 RipEX Radio modem Router RACOM s r o 42 Network planning ...
Страница 222: ...Fig 10 3 ATEX Certificate RipEX 2 3 RipEX Radio modem Router RACOM s r o 222 Safety environment licensing ...
Страница 223: ...Fig 10 4 ATEX Certificate RipEX 3 3 223 RACOM s r o RipEX Radio modem Router Safety environment licensing ...