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Re: Site-to-site VPN between 3 locations (hairpin NAT)

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Topology like below

spokeA(SSG 192.168.1.0)  <--- tunnel.1A (VPN) ---> Hub (DataCenter SSG) <--- tunnel.1B ---> spokeB(PA 172.16.2.0)
<--- tunnel.2A (P2P) --->

Previously, I set route from spokeA to spoke B use tunnel.1A. But route from Hub to spokeA use tunnel.2A. And I change spokeA to spokeB to use tunnel.2A now. 

After changed:

1. Both spokes gateway can ping each other. (Success)

2. SpokeB gateway/workstations can ping spokeA gateway/workstations (Success)

3. SpokeA workstations can ping spokeB gateway (Success)

4. SpokeA gateway/workstations cannot ping spokeB workstations (Fail)

 

pcap file genereated from PA show the reply were all drop

1	0.000000	172.16.2.11	192.168.1.1	ICMP	146	Echo (ping) reply    id=0x0400, seq=6968/14363, ttl=127
2	0.988816	172.16.2.11	192.168.1.1	ICMP	146	Echo (ping) reply    id=0x0400, seq=7068/39963, ttl=127
3	1.988057	172.16.2.11	192.168.1.1	ICMP	146	Echo (ping) reply    id=0x0400, seq=7168/28, ttl=127
4	2.988217	172.16.2.11	192.168.1.1	ICMP	146	Echo (ping) reply    id=0x0400, seq=7268/25628, ttl=127
5	3.987972	172.16.2.11	192.168.1.1	ICMP	146	Echo (ping) reply    id=0x0400, seq=7368/51228, ttl=127

pcap also show transmit all "no response found"

1	0.000000	192.168.1.1	172.16.2.11	ICMP	146	Echo (ping) request  id=0x0400, seq=6968/14363, ttl=61 (no response found!)
2	0.988672	192.168.1.1	172.16.2.11	ICMP	146	Echo (ping) request  id=0x0400, seq=7068/39963, ttl=61 (no response found!)
3	1.988291	192.168.1.1	172.16.2.11	ICMP	146	Echo (ping) request  id=0x0400, seq=7168/28, ttl=61 (no response found!)
4	2.988150	192.168.1.1	172.16.2.11	ICMP	146	Echo (ping) request  id=0x0400, seq=7268/25628, ttl=61 (no response found!)
5	3.988147	192.168.1.1	172.16.2.11	ICMP	146	Echo (ping) request  id=0x0400, seq=7368/51228, ttl=61 (no response found!)

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