[strongSwan] stongswan tunnel up but child subnets not pinging

Yeagley, Josiah jyeagley at harris.com
Fri Feb 19 15:04:52 CET 2016

I wish I could help you more Chris but it sounds like you are having the same problem I am and are stuck in the same spot.... I've asked for help on a number of different forums and this mailing list but no one seems willing or able to help :-\ If you do get it working please make sure to post what you did to fix it and I'll do the same if I get it working. 

~ Josiah s. Yeagley

-----Original Message-----
From: christopher kamutumwa [mailto:chriskamutumwa at gmail.com] 
Sent: Friday, February 19, 2016 5:55 AM
To: Noel Kuntze <noel at familie-kuntze.de>
Cc: Users at lists.strongswan.org; Yeagley, Josiah (U.S. Person) <jyeagley at harris.com>
Subject: Re: stongswan tunnel up but child subnets not pinging

i have made all changes but problem still there need more help.
changes made below and attached ipsec.conf/message log/ statusall/routing table/iptable

IP forwarding enabled in /etc/sysctl.conf net.ipv4.ip_forward = 1

removed That line is formatted wrong. "-diffie-hellman group 2" is invalid

did this Don't declare options multiple times in a conn section.
flushed routing table to default-strongSwan does the routing for you.
Don't install routes yourself.

On 2/16/16, Noel Kuntze <noel at familie-kuntze.de> wrote:
> On 16.02.2016 18:03, christopher kamutumwa wrote:
>> Hi does this mean if I flush my iptables and routing tables 
>> strongswan willroute and write firewall.and how can I tell that?
> No.
> strongSwan, by default, inserts routes into table 220 and uses policy 
> based routing to route the traffic to the remote side(s) into routing 
> table 220, where routes to the protected subnets are in.
> You seem to not have read the introduction[1] yet. Please read it.

added iptables -t nat -I POSTROUTING -s -o eth0 -m policy --dir out --pol ipsec --proto esp -j ACCEPT iptables -t nat -I PREROUTING -s -i eth0 -m policy --dir in --pol ipsec --proto esp -j ACCEPT iptables -A input_rule -p esp -j ACCEPT iptables -A input_rule -p udp --dport 500 -j ACCEPT iptables -A input_rule -p udp --dport 4500 -j ACCEPT

but still no pings to and from the other side though IKE_SA has always been up. please help

> [1]
> https://wiki.strongswan.org/projects/strongswan/wiki/IntroductionTostr
> ongSwan
> (Second mail, first one was sent to Christopher only)
> --
> Mit freundlichen Grüßen/Kind Regards,
> Noel Kuntze
> GPG Key ID: 0x63EC6658
> Fingerprint: 23CA BB60 2146 05E7 7278 6592 3839 298F 63EC 6658

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