![Telindus 1031 User And Reference Manual Download Page 189](http://html.mh-extra.com/html/telindus/1031/1031_user-and-reference-manual_1083538189.webp)
Telindus 1031 Router
Chapter 10
Reference manual
179
telindus1031/lanInterface/arp
Use this attribute to configure the Address Resolution Protocol (ARP)
cache.
The
arp
structure contains the following elements:
What is the ARP cache?
The LAN interface has been allocated a fixed Ethernet address, also called MAC (Medium Access Con-
trol) address. This MAC address is not user configurable. The IP address of the LAN interface, on the
other hand, is user configurable. This means that the user associates an IP address with the predefined
MAC address. The MAC address - IP address pairs are kept in a table, called the ARP cache. Refer to
telindus1031/lanInterface/arpCache
for an example of such a table.
How does the ARP cache work?
Before the Telindus 1031 Router sends an IP packet on the LAN interface, it has to know the MAC
address of the destination device. If the address is not present in the ARP cache table yet, the Telindus
1031 Router sends an ARP request on the Ethernet to learn the MAC address and associated IP
address of the destination device. This address pair is then written in the ARP cache. Once the address
pair is present, the Telindus 1031 Router can reference to this pair if it has to send an IP packet to the
same device later on.
The ARP cache time-out
Summarised, all the MAC address - IP address pairs from ARP requests and replies received on the
LAN interface are kept in the ARP cache. However, if devices on the network are reconfigured then this
MAC address - IP address relation may change. Therefore, the ARP cache entries are automatically
removed from the cache after a fixed time-out. This time-out period can be set with the
element.
Value
Description
timeOut
Use this element to set the ageing time of the ARP
cache entries. Refer to
proxyArp
Use this element to enable or disable the ARP cache
mechanism.
Default:-
Range: structure, see below
Default:00000d 02h 00m 00s
Range: 00000d 00h 00m 00s -
24855d 03h 14m 07s
Default:enabled
Range: enabled / disabled
Summary of Contents for 1031
Page 11: ...Telindus 1031 Router User manual 1 User manual ...
Page 12: ...Telindus 1031 Router User manual 2 ...
Page 80: ...Telindus 1031 Router Chapter 5 User manual Basic configuration 70 ...
Page 168: ...Telindus 1031 Router Chapter 8 User manual Configuring the bridge 158 ...
Page 179: ...Telindus 1031 Router Reference manual 169 Reference manual ...
Page 180: ...Telindus 1031 Router Reference manual 170 ...
Page 308: ...Telindus 1031 Router Chapter 11 Reference manual Status attributes 298 ...
Page 336: ...Telindus 1031 Router Chapter 12 Reference manual Performance attributes 326 ...
Page 348: ...Telindus 1031 Router Chapter 13 Reference manual Alarm attributes 338 ...
Page 362: ...Telindus 1031 Router Chapter 15 Reference manual Auto installing the Telindus 1031 Router 352 ...
Page 370: ...Telindus 1031 Router Chapter 16 Reference manual Downloading software 360 ...
Page 380: ...Telindus 1031 Router Chapter 17 Reference manual Technical specifications 370 ...
Page 381: ...Telindus 1031 Router Annex 371 Annex ...
Page 382: ...Telindus 1031 Router Annex 372 ...
Page 384: ...Telindus 1031 Router Annex A Annex common TCP and UDP numbers 374 ...
Page 386: ...Telindus 1031 Router Annex B Annex product information 376 ...