Re: Incoming ESP Packets disappear

[Michael Tremer <michael.tremer@ipfire.org>]

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Hi Stephan,

What is the output of “ipsec statusall” on both systems?

Best,
-Michael

> On 30 Apr 2020, at 22:28, Stephan Mending <list(a)md5collisions.eu> wrote:
> 
> Hello,
> 
> I have a situation. ;)
> 
> It looks like the following:
> 
> 
> (SRV-01) ----------- (IPFIRE) -------orange------- (SRV-02)
> 
> public-IP     192.168.0.100
> 
> 
> SRV-01 is hooked up to the ipfire via a roadwarrior IPsec connection. Establishment of the tunnel works as one would expect it.
> 
> ping from SRV-02 to SRV-01 works fine and passes through the tunnel. So far,  so good.
> 
> ping from SRV-01 to SRV-02 does not.
> 
> 
> Iptables is blocking ? No, I did check that. Nothing.
> 
> IPS ? No, neither.
> 
> 
> So what's the matter ? When watching the interface using tcpdump I can see ESP packets and afterwards its unencrypted icmp echo request content (both on ppp0). That is the end.
> 
> And  the packet has never been seen any after.
> 
> Anyone an idea?
> 
> 
> (Yes the SRV-02 accepts incoming icmp type 8  and outgoing type 0)
> 
> 
> Best regards,
> 
> Stephan
> 
>