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 :: Mailing Lists

[ILUG] ARP Insanity!

[ILUG] ARP Insanity!

Tomek tomek.777 at interia.pl
Tue Feb 21 13:21:31 GMT 2006


Is there any bridge? Have you checked and manually deleted the wrong address from most important (switches, ARP proxies, servers, the third machine) ARP caches?

Regards,

Tomek

Nick Murtagh napisał(a):
> Hi!
> 
> 
> I've moved an IP address from server A to server B.
> 
> Server A is still responding to ARP requests for the IP address!
> 
> The interface on Server A that had the IP address has been removed,
> and networking has since been restarted. No software is listening on
> that IP address.
> 
> Both servers are Ubuntu Breezy.
> 
> 
> On Server A:
> 
> # netstat -anp -A inet | grep 10.2.1.230
> #
> 
> 
> Also on Server A:
> 
> # ip addr
> 1: lo: >LOOPBACK,UP> mtu 16436 qdisc noqueue
>      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>      inet 127.0.0.1/8 scope host lo
> 2: eth0: >BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
>      link/ether 00:14:22:b0:5e:80 brd ff:ff:ff:ff:ff:ff
>      inet 10.2.1.15/24 brd 10.255.255.255 scope global eth0
>      inet 10.2.1.231/24 brd 10.255.255.255 scope global secondary eth0:0
>      inet 10.2.1.16/24 brd 10.255.255.255 scope global secondary eth0:1
> 3: eth1: >BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
>      link/ether 00:14:22:b0:5e:81 brd ff:ff:ff:ff:ff:ff
> #
> 
> 
>  From a third machine:
> 
> # arping 10.2.1.230
> ARPING 10.2.1.230 from 10.2.1.22 eth0
> Unicast reply from 10.2.1.230 [00:14:22:B0:5E:80]  0.833ms
> Unicast reply from 10.2.1.230 [00:20:ED:79:2F:70]  0.920ms
> Unicast reply from 10.2.1.230 [00:20:ED:79:2F:70]  0.644ms
> Sent 2 probes (1 broadcast(s))
> Received 3 response(s)
> #
> 
> 
> Any ideas? I must be missing something obvious...
> 
> 
> Nick
> -- 
> Irish Linux Users' Group mailing list
> Email: ilug at linux.ie
> Options (including unsubscribe) here:
> http://mail.linux.ie/mailman/listinfo/ilug
> 
> 
> 



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