Hi,
  I have successful connection from my Sierra Mac using strongswan-5.6.1 to
our vpn server

$ sudo ipsec up  vpn
Password:
initiating IKE_SA vpn[2] to xxxx
*...........<removed for brevity>*
*installing 10.245.250.251 as DNS server*
*installing 10.245.250.227 as DNS server*
*installing new virtual IP 10.244.15.1*
*created TUN device: utun2*
*CHILD_SA vpn{2} established with SPIs c13091e4_i c869298c_o and TS
10.244.15.1/32 <http://10.244.15.1/32> === 0.0.0.0/32 <http://0.0.0.0/32>*
*connection 'vpn' established successfully*

$ ifconfig utun2
utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
options=6403<RXCSUM,TXCSUM,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
inet 10.244.15.1 --> 10.244.15.1 netmask 0xff000000

but no traffic is flowing, can't reach hosts/internet. Actually I am not
able to ping the VIP itself

$ ping 10.244.15.1
*PING 10.244.15.1 (10.244.15.1): 56 data bytes*
*Request timeout for icmp_seq 0*
*Request timeout for icmp_seq 1*
*^C*
*--- 10.244.15.1 ping statistics ---*
*3 packets transmitted, 0 packets received, 100.0% packet loss*

initiator configurations
````````````````````````````
config setup

conn %default
        compress=yes
        ikelifetime=20h
        keylife=20m
        rekeymargin=3m
        keyingtries=1
        keyexchange=ikev2

conn vpn
        left=%any
        leftid=kart...@altiscale.com
        rightid=@vpn02.rt1.altiscale.com
        rightauth=pubkey
        leftsourceip=%config
        rightsubnet=0.0.0.0/0
        auto=add
        ike=aes256-sha512-modp4096!
        esp=aes128-sha512!

The same configs work well on a linux initiator.

Any suggestions please ? Please let me know if you need more info

Thanks

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