[Swan] LibreSwan VPN Established | No Data Passing Through

[Paul Wouters]

Can you ping from that machine using its internal IP and see if ESPout increases ?

Sent using a virtual keyboard on a phone

> On Nov 19, 2022, at 13:14, Kumar P S Udai <kumar.udai at zuwissen.com> wrote:
> 
> 
> Hi Paul
> I tried the above step and a few other possibilities too, but there is no change in result
> 
> 000 #8: "PLSUBNET":4500 STATE_V2_ESTABLISHED_IKE_SA (established IKE SA); EVENT_SA_REKEY in 26251s; newest ISAKMP; idle;
> 000 #9: "PLSUBNET":4500 STATE_V2_ESTABLISHED_CHILD_SA (IPsec SA established); EVENT_SA_REKEY in 26637s; newest IPSEC; eroute owner; isakmp#8; idle;
> 000 #9: "PLSUBNET" esp.1ef8c43f at 9.8.7.6 esp.1e4d5a5 at 10.10.128.100 tun.0 at 9.8.7.6 tun.0 at 10.10.128.100 Traffic: ESPin=5KB ESPout=0B! ESPmax=0B 
> 
> I use nftables on the machine and I added the equivalent command, but to no avail.  Also for an experiment's sake, I disabled the NAT function on that machine and kept only the filter ruleset, but even that did not change anything. 
> 
> Thanks, best regards
> 
> Udai
> 
>> On Fri, 18 Nov 2022 at 21:37, Paul Wouters <paul at nohats.ca> wrote:
>> On Fri, 18 Nov 2022, Kumar P S Udai wrote:
>> 
>> > One is at the HO establishing connection to three other branch offices, while all three are
>> > getting connected, at one branch office the public IP is not configured on the machine directly,
>> > but on an external vendor's router.  Initially I had trouble establishing connection to this unit,
>> > but after a lot of reading and config change, the connection is getting established now, but I
>> > cannot ping or reach each other.  Attaching the config details FYI please.  Would appreciate any
>> > help from the community.
>> 
>> > ON MACHINE PLUTO
>> 
>> > 000 #45: "PLSUBNET" esp.716c376b at 9.8.7.6 esp.fdc71b0a at 10.10.128.100 tun.0 at 9.8.7.6
>> > tun.0 at 10.10.128.100 Traffic: ESPin=1KB ESPout=0B! ESPmax=0B
>> 
>> Note traffic coming in, but no traffic going out.
>> 
>> > ON MACHINE EUROPA
>> 
>> > 000 #6276: "PLUTOSUBNET" esp.fdc71b0a at 1.2.3.4 esp.716c376b at 9.8.7.6 tun.0 at 1.2.3.4 tun.0 at 9.8.7.6
>> > Traffic: ESPin=0B ESPout=1KB! ESPmax=0B
>> > 000  
>> 
>> traffic going out, but no traffic coming in.
>> 
>> I suspect that on machine PLUTO, there is a NAT rule that ends up NATing
>> the traffic before it gets to be IPsec'ed
>> 
>> On PLUTO try:
>> 
>> iptables -I FORWARD -t nat -s 192.168.14.0/24  -d 192.168.1.0/24 -j RETURN
>> 
>> Paul
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