[ELDK] ARP Messages

Luigi Rizzi rizzi at algorab.com
Wed Nov 17 12:57:32 CET 2010


I'm facing a strange behave on the ARP answers from  my TQM885D module (U-boot 1.3.0-rc2 and kernel 2.4.25).
When I connect both Ethernet interfaces, for example configured as follow:

Eth1:    IP           MAC 00:23:DE:CC:12:01
Eth2:    IP         MAC 00:23:DE:CC:12:02

If an ARP request arrives from the net the module sends two answers (from the two interfaces)  with the same IP and different MACs.

Here the packets I can see on the Ethernet sniffer:

Source                         Destination       Protocol    Info
CompaqHp                   Broadcast         ARP         Who has
00:23:DE:CC:12:01       CompaqHp        ARP is at 00:23:DE:CC:12:01
00:23:DE:CC:12:02       CompaqHp        ARP is at 00:23:DE:CC:12:02

Anyone can tell me the reason why I'm getting also the second answer (of course a wrong answer) ?

Best Regards,

[cid:image001.jpg at 01CB8656.FF9A68D0]<http://www.algorab.com/>

Luigi Rizzi
Hardware & Firmware engineer
Via Negrelli 21/13
38015 Lavis (TN) - ITALY
Tel +39 0461 242482
Fax +39 0461241512
Skype luigi.rizzi.algorab
email rizzi at algorab.com<mailto:rizzi at algorab.com>

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