OK, I ran the debug on both sides, simultaneously. Our main site (192.168.1.1/24) recorded absolutely nothing to the other IP (172.16.10.1/24). However from the satellite side (172.16.10.1/24) I recorded:
SSG140-> get db stream
install v6 vector flow_ttl_vector
install v6 vector flow_l2prepare_xlate_vector
install v6 vector flow_frag_list_vector
install v6 vector flow_fragging_vector1
install v6 vector flow_encap_vector
install v6 vector flow_fragging_vector
install v6 vector flow_send_shape_vector
## 2017-11-02 15:33:54 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:54 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:55 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:55 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:56 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:56 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:57 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:57 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:58 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
## 2017-11-02 15:33:58 : NHTB entry search not found: vpn none tif tunnel.1 nexthop 192.168.1.1
This led me to believe the NHTB entries may be incomplete, so I added the 192.168.1.1 as shown below:
D 68.179.20.145 Site B VPN Up -
S 192.168.1.1 Site B VPN Up Remove
I then ran the debug again with 5 pings to the destination:
## 2017-11-02 15:38:51 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:51 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:52 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:52 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:53 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:53 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:54 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:54 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:55 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-02 15:38:55 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4