On Thu, 2016-04-07 at 16:19 +0200, Christof Koehler wrote: > Hello everybody, > > I am on ubuntu 14.04 with autofs 5.0.7 and I observe an (for me) > unexpected behaviour as detailed below. Apparently using autofs NFS4 > mounts fall back to using IPv4 addresses although valid IPv6 addresses > are available under certain circumstances, while a plain mount works > as > expected. Can you provide a full debug log. It might be autofs interfering with the mount but mount.nfs(8) is a more likely candidate. > > Setup: > ------ > Both, NFS server and client, are configured with an IPv4 address and > an > IPv6 GUA and IPv6 ULA. For brevity I will shorten the IPv4 address to > 192, the GUA to 2001 and the ULA to fd5f below. I will only change > the > DNS AAAA record in the following, the network configuration on > server/client or the A records never change. Server and client have > always working IPv4 and IPv6 GUA and ULA. > > Test with mount: > ---------------- > Using a plain "mount -t nfs4 server:/locals /mnt/disk1/" on the > client > gives depending on the DNS entries for the server the expected > source/target selection: > > Server DNS entry| client address used to mount > 2001 | 2001 > fd5f | fd5f > 2001+fd5f | fd5f > > So in all cases RFC 6724/3484 is observed selecting the addresses. > Please note that the server has two AAAA records (multi-homed) in the > last test. > > Test with autofs: > ----------------- > A map lookup will yield "-fstype=nfs4,rw,intr,nosuid,soft,nodev > server:/locals" > for the mount. Now I change again the servers AAAA records with the > following result: > > Server DNS entry| client address used to mount > 2001 | 2001 > fd5f | fd5f > 2001+fd5f | 192 > > For a multi-homed NFS4 server autofs apparently falls back to IPv4 > although valid IPv6 options exist. As shown above just mounting > without > autofs would stick to RFC 6724/3484 instead. I believe that autofs > should > also select fd5f ULAs in the multi-homed case. > > Is this a known behaviour ? Do any workarounds exist ? I could not > find > anything. > > I tried to compile autofs 5.1.1 with --with-libtirpc because > of https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/1101779 but > could not get the binary to work. I filed a bug report for the > behaviour > described above > https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/1564380 > but suspect that this is better suited for this list. > > Best Regards > > Christof > -- To unsubscribe from this list: send the line "unsubscribe autofs" in
