[Swan] not able to establish tunnel with multiple subnets and IKEv2

[Paul Wouters]

On Wed, 5 Jun 2019, optimas primat wrote:

> I am trying to create site-to-site IPsec VPN with two subnets on each
> site using libreswan on linux gateways.

> conn siteA_ipsec
>        left=172.16.99.11
>        leftsourceip=172.16.99.11
>        right=%any
>        leftsubnets={172.16.55.0/24,172.16.56.0/24}
>        rightsubnets={172.16.66.0/24,172.16.67.0/24}
>        auto=add

> conn siteB_ipsec
>        left=172.16.88.88
>        leftsourceip=172.16.88.88
>        right=172.16.99.11
>        leftsubnets={172.16.66.0/24,172.16.67.0/24}
>        rightsubnets={172.16.55.0/24,172.16.56.0/24}
>        auto=start

You should not use leftsourceip= when using multiple leftsubnets

> I get TS_UNACCEPTABLE error in pluto logs and tunnel gets established
> for only one subnet pair. When I change right=%any to
> right=172.16.88.88 in Site A's config, tunnel gets established
> successfully for all subnet pairs. As per requirement, I don't want to
> specify Site B's IP address at Site A, as it will be dynamic. Hence I
> used right=%any initially. But same config works with IKEv1.

Can you try without the sourceip= lines? If you still see an issue can
you then show some logs about what/why it is failing?

Paul