Date: Sat, 27 Aug 2016 17:22:04 +0100 From: Roger Leigh <rleigh@codelibre.net> To: freebsd-jail@freebsd.org Subject: Jails and IPv6 local loopback Message-ID: <bd642bc0-32f4-4589-28b5-e9d3d6c4953b@codelibre.net>
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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 % freebsd-version 10.3-RELEASE-p6 % jls JID IP Address Hostname Path [...] 3 192.168.1.12 bfcpp.codelibre.net /jail/bfcpp [...] From jail.conf: bfcpp { host.hostname = "bfcpp.codelibre.net"; interface = "bge0"; ip4.addr = "192.168.1.12"; ip6.addr = "2001:8b0:860:ddbd:3aea:a7ff:feab:7002"; allow.raw_sockets = "1"; path = "/jail/bfcpp"; mount.devfs; mount.fdescfs; mount.procfs; mount.fstab="/etc/fstab.bfcpp"; exec.start = "/bin/sh /etc/rc"; exec.stop = "/bin/sh /etc/rc.shutdown"; exec.clean; exec.jail_user = "root"; exec.system_jail_user; } amys% 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=0.046 ms --- localhost ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.046/0.046/0.046/0.000 ms amys% ping6 -c1 localhost PING6(56=40+8+8 bytes) ::1 --> ::1 16 bytes from ::1, icmp_seq=0 hlim=64 time=0.252 ms --- localhost ping6 statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/std-dev = 0.252/0.252/0.252/0.000 ms Inside this jail: 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 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (100baseTX <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 localhost PING localhost (127.0.0.1): 56 data bytes 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.056 ms ^C --- localhost ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.056/0.056/0.056/0.000 ms bfcpp% ping6 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 ping6: sendmsg: Can't assign requested address ping6: wrote localhost 16 chars, ret=-1 ping6: sendmsg: Can't assign requested address ping6: wrote localhost 16 chars, ret=-1 ^C --- localhost ping6 statistics --- 3 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? Thanks, Roger
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