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RE: [PLUG] IBM Thin Client and Red Hat Linux Networking
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Thanks Paul! I think I got it this time.
Tcpdump was the only thing I didn't try. Here are some results:
1. On w2k(10.1.2.41), arp table is empty, ping RH (10.1.2.58),
windump -n host 10.1.2.58 captures:
================================================================
13:37:53.736436 arp who-has 10.1.2.58 tell 10.1.2.41
13:37:53.736673 arp reply 10.1.2.58 is-at 0:8:c7:f3:ba:8
13:37:53.736691 10.1.2.41 > 10.1.2.58: icmp: echo request
13:37:53.736927 10.1.2.58 > 10.1.2.41: icmp: echo reply
13:37:54.734484 10.1.2.41 > 10.1.2.58: icmp: echo request
13:37:54.734721 10.1.2.58 > 10.1.2.41: icmp: echo reply
13:37:55.735930 10.1.2.41 > 10.1.2.58: icmp: echo request
13:37:55.736170 10.1.2.58 > 10.1.2.41: icmp: echo reply
13:37:56.747390 10.1.2.41 > 10.1.2.58: icmp: echo request
13:37:56.747629 10.1.2.58 > 10.1.2.41: icmp: echo reply
13:37:58.726564 arp who-has 10.1.2.41 tell 10.1.2.58
13:37:58.726599 arp reply 10.1.2.41 is-at 0:1:2:2e:fa:9b
=================================================================
2. On w2k(10.1.2.41), arp table is empty, ping NetVista (10.1.4.222),
windump -n host 10.1.4.222 captures:
=================================================================
13:38:28.693243 arp who-has 10.1.4.222 tell 10.1.2.41
13:38:28.693523 10.1.2.41 > 10.1.4.222: icmp: echo request
13:38:29.688486 10.1.2.41 > 10.1.4.222: icmp: echo request
13:38:30.689924 10.1.2.41 > 10.1.4.222: icmp: echo request
13:38:31.691368 10.1.2.41 > 10.1.4.222: icmp: echo request
=================================================================
3. On RH(10.1.2.58), arp table is empty. Ping 10.1.2.41,
tcpdump -n host 10.1.2.41 captures:
================================================================
13:56:37.526721 arp who-has 10.1.2.41 tell 10.1.2.58
13:56:37.526721 arp reply 10.1.2.41 is-at 0:1:2:2e:fa:9b
13:56:37.526721 10.1.2.58 > 10.1.2.41: icmp: echo request (DF)
13:56:37.526721 10.1.2.41 > 10.1.2.58: icmp: echo reply (DF)
================================================================
4. On RH(10.1.2.58), arp table is empty. Ping 10.1.4.222,
tcpdump -n host 10.1.4.222 captures:
================================================================
13:57:36.436721 arp who-has 10.1.4.222 tell 10.1.2.58
13:57:37.436721 arp who-has 10.1.4.222 tell 10.1.2.58
13:57:38.436721 arp who-has 10.1.4.222 tell 10.1.2.58
After comparing the results, we can see NetVista doesn't reply to arp
request! This is why RH can't ping NetVista. But why can a W2k box ping
NetVista? I have not figured out.
Something interesting is that any ping to RH involving two arps, one is
"who is RH?" , the other is "who is pinging me? "from RH. After the
ping, RH will have an entry for the pinger in its arp table.
Jing
-----Original Message-----
From: plug-admin@lists.phillylinux.org
[mailto:plug-admin@lists.phillylinux.org] On Behalf Of Paul
Sent: Thursday, February 28, 2002 9:47 PM
To: plug@lists.phillylinux.org
Subject: Re: [PLUG] IBM Thin Client and Red Hat Linux Networking
Jing,
What does "traceroute" show? Have you tried running "tcpdump" on the
linux
box to see if the ping packets are hitting its interface? Does "arp"
resolve the IPs to their proper MAC addresses?
______________________________________________________________________
Philadelphia Linux Users Group - http://www.phillylinux.org
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______________________________________________________________________
Philadelphia Linux Users Group - http://www.phillylinux.org
Announcements-http://lists.phillylinux.org/mail/listinfo/plug-announce
General Discussion - http://lists.phillylinux.org/mail/listinfo/plug
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