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Cilium causes host applications to use IPv6 instead of IPv4 #267

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aanm opened this issue Jan 25, 2017 · 6 comments · Fixed by #1555
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Cilium causes host applications to use IPv6 instead of IPv4 #267

aanm opened this issue Jan 25, 2017 · 6 comments · Fixed by #1555
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kind/bug This is a bug in the Cilium logic.

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@aanm
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aanm commented Jan 25, 2017

I had to delete cilium_host as a workaround.

[aanm@AM-laptop ~]$ ping irc.freenode.net
PING irc.freenode.net(leguin-admin.acc.umu.se (2001:6b0:e:2a18::118)) 56 data bytes
^C
--- irc.freenode.net ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 1021ms
[aanm@AM-laptop ~]$ sudo ip l d cilium_host
[aanm@AM-laptop ~]$ ping irc.freenode.net
PING chat.freenode.net (130.239.18.119) 56(84) bytes of data.
64 bytes from leguin.acc.umu.se (130.239.18.119): icmp_seq=1 ttl=45 time=92.1 ms
^C
--- chat.freenode.net ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 92.176/92.176/92.176/0.000 ms
@aanm aanm added the kind/bug This is a bug in the Cilium logic. label Jan 25, 2017
@tgraf
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tgraf commented Jan 25, 2017

Was cilium_host the only interface with an IPv6 address on it?

@aanm
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aanm commented Jan 25, 2017

With the scope global yes.

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tgraf commented Jan 25, 2017

OK, that explains it. I think we can change the scope to host as packets on that interface never leave the host.

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tgraf commented Jan 25, 2017

Can you try

ip addr add $HOST_IP/128 dev $HOST_DEV1 scope host

in bpf/init.sh?

@aanm
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aanm commented Jan 25, 2017

doesn't work, seems like f00d:: is mandatory to be scope global.

sudo ip addr del f00d::c0a8:66:0:ffff/128 dev cilium_host 2> /dev/null || true
sudo ip addr add f00d::c0a8:66:0:ffff/128 dev cilium_host scope host
ip -6 a s cilium_host

52: cilium_host@cilium_net: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 f00d::c0a8:66:0:ffff/128 scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::a86d:ffff:fe8c:cf/64 scope link 
       valid_lft forever preferred_lft forever

Should we change the f00d prefix?

@tgraf tgraf added this to the 0.9 milestone Mar 18, 2017
@tgraf tgraf modified the milestones: 0.10, 0.9 May 15, 2017
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tgraf commented Jun 20, 2017

Possible solution: use of a site local IPv6 address for the cilium_host

@tgraf tgraf self-assigned this Jun 20, 2017
@tgraf tgraf removed this from the 0.10 milestone Jul 22, 2017
@tgraf tgraf assigned aanm and unassigned tgraf Sep 18, 2017
tgraf added a commit that referenced this issue Sep 20, 2017
@tgraf
nodeaddress: Use a IPv6 site local address as host address
7f5f10a 
This resolves an issue where running Cilium will configure a global
scope address for the system which causes getaddrinfo() to start
returning IPv6 addresses for DNS requests even though the system may not
have actual IPv6 connectivity.

Fixes: #267

Signed-off-by: Thomas Graf <thomas@cilium.io>
@tgraf tgraf mentioned this issue Sep 20, 2017
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tgraf added a commit that referenced this issue Sep 20, 2017
@tgraf
nodeaddress: Use a IPv6 site local address as host address
41805e4 
This resolves an issue where running Cilium will configure a global
scope address for the system which causes getaddrinfo() to start
returning IPv6 addresses for DNS requests even though the system may not
have actual IPv6 connectivity.

Fixes: #267

Signed-off-by: Thomas Graf <thomas@cilium.io>
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nodeaddress: Use a IPv6 site local address as host address cilium/cilium
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