IPv6 default route mising without addrconf in lx zones about illumos-omnios

[sjorge]

Of note, I stumbled in this mess while trying to re-validate ubuntu in LX now that 22.04 has an image. It's still broken in other 'fun' ways.

e.g.

root@ubt2204:~# curl -6 ifconfig.co
2a02:578:470f:10::159
root@ubt2204:~# ping6 ifconfig.co
ping6: IPV6_RECVERR: Protocol not available

The last known version to work is 16.04

root@ubuntu-14-04-b:~# curl -6 ifconfig.co
2a02:578:470f:10::159
root@ubuntu-14-04-b:~# ping6 ifconfig.co
WARNING: your kernel is veeery old. No problems.
PING ifconfig.co(2606:4700:3036::ac43:85e4) 56 data bytes
64 bytes from 2606:4700:3036::ac43:85e4: icmp_seq=1 ttl=59 time=3.08 ms
64 bytes from 2606:4700:3036::ac43:85e4: icmp_seq=2 ttl=59 time=3.79 ms
^C
--- ifconfig.co ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 3.088/3.439/3.791/0.356 ms

IIRC the warning is because it does some sort of fallback, which we newer ubuntu's do not.

[sjorge]

This warrants the question, is this worth fixing in lx_init if the actual user-space stuff is not going to be happy and have weird unpredictable results depending (on I assume the syscalls it tries).

[sjorge]

If OmniOS doesn't have https://smartos.org/bugview/OS-4683 it is probably also something that should be pulled in.

[citrus-it]

If OmniOS doesn't have https://smartos.org/bugview/OS-4683 it is probably also something that should be pulled in.

We don't, but it's one we definitely should look into.

[bahamat]

FWIW, on SmartOS, we assume that if there's a static IP set, there needs to also be a static gateway defined.

[sjorge]

That would also be acceptable if a 2nd defrouter entry could take an ipv6 one.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[sjorge]

Unstale

[sjorge]

For those playing a round at home

cat > /usr/local/sbin/svc_lx_helper << SVC_LX_HELPER
#!/usr/bin/bash

echo "Mounting ZFS datasets ..."
/native/sbin/zfs mount -a

if [ ! -e /etc/inet/ndpd.conf ]; then
  echo "Creating /etc/inet/ndpd.conf ..."
  mkdir -p /etc/inet
  cat > /etc/inet/ndpd.conf << EOF
ifdefault StatefulAddrConf off
ifdefault StatelessAddrConf off
EOF

  echo "Reboot triggered by ndpd.conf creationg."
  reboot
fi
SVC_LX_HELPER

chmod +x /usr/local/sbin/svc_lx_helper

cat > /etc/systemd/system/lx-helper.service << SYSTEMD_SERVICE
[Unit]
Description=LX Zone Helper
Require=native-usr.service
Before=network-pre.target

[Service]
Type=simple
ExecStart=/usr/local/sbin/svc_lx_helper

[Install]
WantedBy=multi-user.target
SYSTEMD_SERVICE
systemctl daemon-reload
systemctl enable --now lx-helper.service

You can avoid the ::/0 addresses that confuse things by disabling all dynamic addresses so it just sets the default router, you can then use a static address.

Above is a little helper systemd unit that does so, it also mounts all delegated datasets.