[strongSwan] help: ping behaviour when tunnel is not established

[Hans-Kristian Bakke]

This is actually easy to solve using normal "network" behaviour, that is
making the IPSec gateway respond with SNMP unreachable message if it can't
send the package to it's destination.

Here is an example using IPtables. In this example the IPsec clients have
addresses in the 10.0.1.0/24 network and they are terminated on the
WAN-interface:

iptables -A WAN_OUTPUT -m policy --dir out --pol ipsec --proto esp -j ACCEPT
iptables -A WAN_OUTPUT -d 10.0.1.0/24 -j REJECT --reject-with
icmp-admin-prohibited

Explanation:
If the package is going out an established connection ACCEPT it. If there
is no established connection reject all packages to the IPsec network with
SNMP-message.


Regards,

*Hans-Kristian Bakke*



On Fri, Apr 13, 2012 at 21:57, Shukla, Sanjay <Sanjay.Shukla at ipc.com> wrote:

>  I request you urgent help in understanding this behavior.****
>
> ** **
>
> When a connection is configured in /etc/ipsec.conf but the left side of
> the connection is not responding (say left is unreachable) I see the ping
> behavior as below****
>
> ** **
>
> root at ffd-ipsec-189 sanjay]# ping 10.204.74.188****
>
> ** **
>
> basically ping is stuck or blocked.****
>
> ** **
>
> ** **
>
> Now if I do not have a connection configured in the /etc/ipsec.conf I see
> that the ping responds like this****
>
> ** **
>
> root at ffd-ipsec-189 sanjay]# ping 10.204.74.188****
>
> PING 10.204.74.188 (10.204.74.188) 56(84) bytes of data.****
>
> From 10.204.74.189 icmp_seq=2 Destination Host Unreachable****
>
> From 10.204.74.189 icmp_seq=3 Destination Host Unreachable****
>
> From 10.204.74.189 icmp_seq=5 Destination Host Unreachable****
>
> ** **
>
> What settings can be done for a timeout to occurs to that a program that
> is trying to reach an ip may not be blocked forever if ipsec SA cannot be
> established ?****
>
> ** **
>
> ** **
>
> My connection setting as follows****
>
> ** **
>
> #Below Are The Configuration for CCM_CCM IPSec Tunnel****
>
> conn LocalIP_LocalIP_10.204.74.188****
>
>         left=10.204.74.189****
>
>         leftcert=ServLcl.pem****
>
>         leftsendcert=yes****
>
>         leftupdown=/opt/ipc/security/ipsectunnel/rightdown.sh****
>
>         right=10.204.74.188****
>
>         rightid=%any****
>
>         keyexchange=ikev2****
>
>         type=transport****
>
>         reauth=no****
>
>         dpddelay=5s****
>
>         dpdaction=restart****
>
>         keyingtries=%forever****
>
>         auto=route****
>
> ** **
>
> regards,****
>
> -sanjay****
>
> **
>
> *Please consider the environment before printing this email.*
>
>
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