netdev - Re: `ip addr show' shows maximum of 56 addresses?

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Date:	Mon, 05 Dec 2011 22:58:40 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Jencks <ben@...ncks.net>
Cc:	netdev@...r.kernel.org
Subject: Re: `ip addr show' shows maximum of 56 addresses?

Le lundi 05 décembre 2011 à 16:12 -0500, Ben Jencks a écrit :
> I'm finding that ip addr show will only give me up to 56 addresses:
> 
> $ ip -6 addr show lo
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 
>     inet6 ::1/128 scope host 
>        valid_lft forever preferred_lft forever
> $ for i in `seq 55` ; do sudo ip addr del fd9a:704e:4d65:136d::`printf '%x\n' $i`/128 dev lo ; done
> $ ip addr show lo | grep inet6 | wc -l
> 56
> $ ip addr show lo | grep ' ::1'
>     inet6 ::1/128 scope host 
> $ sudo ip addr add fd9a:704e:4d65:136d::`printf '%x\n' 56`/128 dev lo
> $ ip addr show lo | grep inet6 | wc -l
> 56
> $ ifconfig lo | grep inet6 | wc -l
> 57
> $ ip addr show lo | grep ' ::1'
> <no output>
> 
> It doesn't even help to specify the address explicitly:
> 
> $ ip addr show dev lo to ::1
> <no output>
> 
> (Ubuntu kernel 2.6.32, tested with both distributed and latest git iproute2)
> 
> I searched for this issue, and even looked in the iproute2/ip/ipaddress.c and couldn't find any explicit limits. Is there a maximum netlink message size causing problems?
> 
> Sorry if this question is too user-ish for a dev list, but both linux-net and lartc looked dead.
> 
> Thanks,
> -Ben--

This was fixed two years ago by commit bcd323262a94b14b in 2.6.33
(ipv6: Allow inet6_dump_addr() to handle more than 64 addresses)



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