host: elwood
path: /usr/local/database/faq/networks
file: arp.txt

M.Braun - MHE 1 - 10.03.99


Frequently asked Questions: Network
-----------------------------------


Q: I have a network connection between workstation and ips (192.9.243.44).
   After testing, I replace the 1st ips with a 2nd one (same adress). But this
   new ips can't be accessed via network, unless the workstation is rebooted
   or the ips initiates a network connection to the workstation.

A: The workstation keeps a translation table from IP adress (Internet Protocol)
   and (hardware) ethernet adress (MAC). This can be viewed with the command
   "arp -a" (invoked as root).

   After changing the network devices, the 2nd ips has a new hardware adress,
   but still the same IP adress. By looking at the translation table, the
   workstation isn't able to find it.

   Solution: Delete the old entry with the command "arp -d ips" (as root).
   After that, the entry in the translation table is created again with the
   first network access (e.g. ping, ftp, telnet, ...).