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. 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 -- Dr. rer. nat. Christof Köhler email: c.koehler@xxxxxxxxxxxxxxxxxxx Universitaet Bremen/ BCCMS phone: +49-(0)421-218-62334 Am Fallturm 1/ TAB/ Raum 3.12 fax: +49-(0)421-218-62770 28359 Bremen PGP: http://www.bccms.uni-bremen.de/cms/people/c_koehler/ -- To unsubscribe from this list: send the line "unsubscribe autofs" in
