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

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Message-ID: <1323143336.7454.225.camel@deadeye>
Date:	Tue, 06 Dec 2011 03:48:56 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ben Jencks <ben@...ncks.net>, netdev@...r.kernel.org
Subject: Re: `ip addr show' shows maximum of 56 addresses?

Eric Dumazet wrote:
> 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)

Seems like a candidate for 2.6.32.y.  I don't think it depends on any of
your other changes for 2.6.33, does it?

Ben.

-- 
Ben Hutchings
Absolutum obsoletum. (If it works, it's out of date.) - Stafford Beer

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