11:12 a.m.
Hi
assuming a host has 2 ips: 192.168.1.1 and 192.168.1.2 (as an ip alias).
By default outgoing traffic is on 192.168.1.1 - is it possible to tell a
rootless container (actually slirp4netns), that 192.168.1.2 should be
used as the src ip?
I would assume that this would need to be done be slirp4netns, but I
wasn't able to find such an option.
thanks and best
mh
4:49 a.m.
On 4/10/20 12:12, mh+podman(a)scrit.ch wrote:
Hi
assuming a host has 2 ips: 192.168.1.1 and 192.168.1.2 (as an ip alias).
By default outgoing traffic is on 192.168.1.1 - is it possible to tell a
rootless container (actually slirp4netns), that 192.168.1.2 should be
used as the src ip?
I would assume that this would need to be done be slirp4netns, but I
wasn't able to find such an option.
thanks and best
mh
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Akihiro or Giuseppe any ideas?
5:34 a.m.
Daniel Walsh <dwalsh(a)redhat.com> writes:
On 4/10/20 12:12, mh+podman(a)scrit.ch wrote:
> Hi
>
> assuming a host has 2 ips: 192.168.1.1 and 192.168.1.2 (as an ip alias).
>
> By default outgoing traffic is on 192.168.1.1 - is it possible to tell a
> rootless container (actually slirp4netns), that 192.168.1.2 should be
> used as the src ip?
>
> I would assume that this would need to be done be slirp4netns, but I
> wasn't able to find such an option.
>
> thanks and best
>
> mh
> _______________________________________________
> Podman mailing list -- podman(a)lists.podman.io
> To unsubscribe send an email to podman-leave(a)lists.podman.io
Akihiro or Giuseppe any ideas?
it should be done in slirp4netns but that is not possible now. I don't
see support for it in libslirp, so we'd first need to support binding to
a device into libslirp.
Giuseppe
2:01 a.m.
New subject: Possible to customize outgoing IP in rootless container
Hi All,
> Akihiro or Giuseppe any ideas?
it should be done in slirp4netns but that is not possible now. I
don't see support for it in libslirp, so we'd first need to support
binding to a device into libslirp.
Thank you for the update.
The reasoning behind it would be to make it easily possible to recognize
traffic from pods in the underlying network, similar to how EgressIPs do
it in the k8s/OCP world.
But looking more into (thought about filing an RFE with
slirp4netns/libslirp) it seems, that this is already in progress:
https://github.com/rootless-containers/slirp4netns/issues/173
https://gitlab.freedesktop.org/slirp/libslirp/issues/14
https://gitlab.freedesktop.org/slirp/libslirp/-/merge_requests/30
So it looks like the necessary plumbing seems to be done, now needs to
expose the capability by slirb4netns and then later into podman.
best
mh
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3 comments
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participants (4)
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Daniel Walsh -
Giuseppe Scrivano -
mh -
mh+podman＠scrit.ch