[strongSwan] unable to install source route for IPv6

[Nan Luo]

Hello, Andreas, hello all

I am trying to bring up a IPv6 tunnel between my SeGW and a strongSwan client running on Linux. The tunnel was able to be setup however strongSwan failed to install the route for virtual endpoint IP (assigned by the SeGW). Thus I was not able to pass data over the tunnel. When I tried to ping6 over the tunnel, ping6 returns "ping: sendmsg: Network is unreachable". I wonder if you have run into this issue before or know how to fix this.

Thanks very much
Nan

The strongSwan trace and my connection configuration is as following:     

strongSwan traces:
.....................
sending packet: from 1080::ac10:202[4500] to 1080::ac10:102[4500]

received packet: from 1080::ac10:102[4500] to 1080::ac10:202[4500]
parsed IKE_AUTH response 5 [ AUTH CP(ADDR6) SA TSi TSr ]
authentication of '1080::ac10:102' with EAP successful
IKE_SA ipv6_sim[4] established between 1080::ac10:202[1080::ac10:202]...1080::ac10:102[1080::ac10:102]
scheduling rekeying in 9998s
maximum IKE_SA lifetime 10538s
installing new virtual IP 1080::abcd:0:2
received netlink error: Invalid argument (22)
unable to install source route for 1080::abcd:0:2
received netlink error: Invalid argument (22)
unable to install source route for 1080::abcd:0:2

conn ipv6_sim
    left=1080::ac10:202
    leftsourceip=%config
    leftfirewall=no
    leftauth=eap
    eap=sim
    eap_identity=1234567
    leftsubnet=1080::abcd:0:0/112
    right=1080::ac10:102
    rightsubnet=1172::ac10:191/112
    rightauth=psk
    auto=add
    esp=3des-aes-sha1-md5-modp1024
    ike=3des-aes-sha1-md5-modp1024
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