OK, so typically after filing this and then reproducing on an old CentOS install I did some more digging.
Issue appears to be that MAXDNSRCH is hard coded to 6 in resolv.h. Not a bug as such but annoying. Also tricky for those of us who have a lot of search domains, quite probably in an enterprise environment where companies have been acquired. For now the only feasible workaround may be to install a local proxy DNS server to workaround this limitation although I've not tried this. Perhaps the init scripts for networking/resolvconf could print a warning if more than six search domains are defined? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1465220 Title: Only first six DNS search domains are used To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1465220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs