Hello pradkm,
The real settings as below
ethernet0/4, DMZ, IP 10.10.20.1
A computer with IP 10.10.20.2
When ping 8.8.8.8 from 10.10.20.2. get session show below logs
SSG140(M)-> get session src-ip 10.10.20.2 alloc 813/max 48064, alloc failed 0, mcast alloc 0, di alloc failed 0 total reserved 0, free sessions in shared pool 47251 Total 31 sessions according filtering criteria. id 41497/s**,vsys 0,flag 00000040/0000/0001/0000,policy 50,time 5, dip 0 module 0 if 8(nspflag 800801):10.10.20.2/27->8.8.8.8/2251,1,0050568af8c4,sess token 13,vlan 0,tun 0,vsd 0,route 25 if 22(nspflag 800800):10.10.20.2/27<-8.8.8.8/2251,1,54e03296dbc1,sess token 4,vlan 0,tun 0,vsd 0,route 1 id 41698/s**,vsys 0,flag 00000040/0000/0001/0000,policy 50,time 6, dip 0 module 0 if 8(nspflag 800801):10.10.20.2/31->8.8.8.8/2251,1,0050568af8c4,sess token 13,vlan 0,tun 0,vsd 0,route 25 if 22(nspflag 800800):10.10.20.2/31<-8.8.8.8/2251,1,54e03296dbc1,sess token 4,vlan 0,tun 0,vsd 0,route 1 id 42014/s**,vsys 0,flag 00000040/0000/0001/0000,policy 50,time 5, dip 0 module 0
directly ping from gateway interface by "ping 8.8.8.8 from ethernet0/4" failed too.
According to route id
route 1 is the default route
-------------------------------------------------------------------------------------- ID IP-Prefix Interface Gateway P Pref Mtr Vsys -------------------------------------------------------------------------------------- * 1 0.0.0.0/0 ethernet0/0 123.123.123.123 SP 20 1 Root
route 25 is auto created by SSG itself when I enabled the ethernet0/4
-------------------------------------------------------------------------------------- ID IP-Prefix Interface Gateway P Pref Mtr Vsys -------------------------------------------------------------------------------------- * 25 10.10.20.0/24 eth0/4 0.0.0.0 C 0 0 Root