I repeated the process with the added "from eth0/x", but there wasn't any difference.
From SSG320 - 192.168.1.0
fw1.hq-> ping 172.16.10.1 from eth0/3
Type escape sequence to abort
Sending 5, 100-byte ICMP Echos to 172.16.10.1, timeout is 1 seconds from ethernet0/3
.....
Success Rate is 0 percent (0/5)
fw1.hq-> get db stream
fw1.hq->
There were no results here, completely blank!
From SSG140 - 172.16.10.0
SSG140-> ping 192.168.1.1 from eth0/2
Type escape sequence to abort
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 1 seconds from ethernet0/2
.....
Success Rate is 0 percent (0/5)
______________________________________________
SSG140-> get db stream
## 2017-11-03 10:13:11 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:11 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:11 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:12 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:12 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:12 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:13 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:13 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:13 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:14 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:14 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:14 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:15 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:15 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4
## 2017-11-03 10:13:15 : NHTB entry search found: vpn none tif tunnel.1 nexthop 192.168.1.1 tunnelid 0x2, flag 0x0, status 4