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Author Topic: eth1 not working (Peharps it is Broken)  (Read 1888 times)
DaniloNC
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« on: August 18, 2011, 09:26:14 PM »

My eth1 interface receives packets but when it sends, the other side doesnt receive.
For instance:

I'm trying to connect my notebook direct on eth1 interface and i have just set my notebook address as 10.21.0.1 and the dreamplug eth1 interface as 10.21.0.2.
I'm ping from 10.21.0.1 to 10.21.0.2 and sniffing on both sides.

On the dreamplug it show the arp response:
root@dreamplug:~# tcpdump -ni eth1
device eth1 entered promiscuous mode
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
01:19:55.519154 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 46
01:19:55.519196 ARP, Reply 10.21.0.2 is-at 02:50:43:34:61:70, length 28
01:19:56.519142 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 46
01:19:56.519170 ARP, Reply 10.21.0.2 is-at 02:50:43:34:61:70, length 28
01:19:57.519124 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 46
01:19:57.519151 ARP, Reply 10.21.0.2 is-at 02:50:43:34:61:70, length 28
01:19:58.529118 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 46
01:19:58.529143 ARP, Reply 10.21.0.2 is-at 02:50:43:34:61:70, length 28
01:19:59.529083 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 46
01:19:59.529110 ARP, Reply 10.21.0.2 is-at 02:50:43:34:61:70, length 28
01:20:00.529058 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 46
01:20:00.529083 ARP, Reply 10.21.0.2 is-at 02:50:43:34:61:70, length 28

but on my notebook the answer never arrive:

01:19:28.624488 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:29.624513 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:30.624492 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:31.634475 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:32.634528 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:33.634482 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:35.634491 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:36.634473 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:37.634457 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:38.634524 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:39.634479 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:40.634489 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:41.644490 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28
01:19:42.644477 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, lengthu 28
01:19:43.644502 ARP, Request who-has 10.21.0.2 tell 10.21.0.1, length 28

I have already tried several cables (Both Straight and Cross Over) and i also tried different kernel versions (2.6.38.8 and 3.0.3) and the same think happened.
There is no iptables rule blocking the response.
When i try to do the same think using eth0 it works.

Is my eth1 interface phisically damaged?
Have you seen this yet?

Regards,
DaniloNC
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