Date: Sat, 27 Aug 2016 18:05:28 -0400 From: Ernie Luzar <luzar722@gmail.com> To: Roger Leigh <rleigh@codelibre.net> Cc: freebsd-jail@freebsd.org Subject: Re: Jails and IPv6 local loopback Message-ID: <57C20EA8.3030906@gmail.com> In-Reply-To: <efa9c4b5-d586-cd4e-d9c3-8132c67da3ec@codelibre.net> References: <bd642bc0-32f4-4589-28b5-e9d3d6c4953b@codelibre.net> <efa9c4b5-d586-cd4e-d9c3-8132c67da3ec@codelibre.net>
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Roger Leigh wrote: > On 27/08/16 17:22, Roger Leigh wrote: >> Hi list, >> >> I saw >> https://lists.freebsd.org/pipermail/freebsd-jail/2011-March/001500.html >> in the archives but didn't see anything more recent. >> >> This is with 10.3-RELEASE > [...] > > And after upgrade to 11.0-RC2: > > bfcpp% ifconfig > bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 > > options=c019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO,LINKSTATE> > > ether 38:ea:a7:ab:61:53 > inet 192.168.1.12 netmask 0xffffffff broadcast 192.168.1.12 > inet6 2001:8b0:860:ddbd:3aea:a7ff:feab:7002 prefixlen 128 vhid 3 > nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> > media: Ethernet autoselect (1000baseT <full-duplex>) > status: active > lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 > options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> > nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> > bfcpp% ping -c1 localhost > PING localhost (127.0.0.1): 56 data bytes > 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.061 ms > > --- localhost ping statistics --- > 1 packets transmitted, 1 packets received, 0.0% packet loss > round-trip min/avg/max/stddev = 0.061/0.061/0.061/0.000 ms > bfcpp% ping6 -c1 localhost > PING6(56=40+8+8 bytes) 2001:8b0:860:ddbd:3aea:a7ff:feab:7002 --> ::1 > ping6: sendmsg: Can't assign requested address > ping6: wrote localhost 16 chars, ret=-1 > > --- localhost ping6 statistics --- > 1 packets transmitted, 0 packets received, 100.0% packet loss > >> As you can see, inside the jail I have a working IPv4 loopback, but not >> a working IPv6 loopback. Both work correctly on the host system. This >> is inconsistent, and it's breaking stuff which needs the v6 loopback to >> be functional. >> >> Is this a case of a bad default, a misconfiguration or a bug in the >> loopback support for jails? > > Note that 11.0-RC2 shows exactly the same behaviour. > > > Regards, > Roger You are not seeing what you think you are seeing. jail(8) is mapping the loopback interface over the jails assigned ipv4 ip address. It only seems reasonable that its doing the same thing with the ipv6 ip address. Check out this PR for more details https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210049
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