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

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Date:	Mon, 5 Dec 2011 16:12:14 -0500
From:	Ben Jencks <ben@...ncks.net>
To:	netdev@...r.kernel.org
Subject: `ip addr show' shows maximum of 56 addresses?

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--
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