"So how does my route table entry loo like ? Will it show both Gateway A and B or only Gateway A?"
[root@LABBIGIP1:Active:Disconnected] config netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 10.0.0.254 0.0.0.0 UG 0 0 0 external
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 external
127.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 tmm
127.7.0.0 127.1.1.253 255.255.0.0 UG 0 0 0 tmm
127.20.0.0 0.0.0.0 255.255.0.0 U 0 0 0 tmm_bp
172.16.0.0 0.0.0.0 255.255.255.0 U 0 0 0 internal
192.168.255.0 0.0.0.0 255.255.255.0 U 0 0 0 mgmt
[root@LABBIGIP1:Active:Disconnected] config tmsh show net route
----------------------------------------------------------------------------------------
Net::Routes
Name Destination Type NextHop Origin
----------------------------------------------------------------------------------------
route_default default gw 10.0.0.254 static 1500
127.20.0.0/16 127.20.0.0/16 interface tmm_bp connected
172.16.0.0/24 172.16.0.0/24 interface /Common/internal connected
10.0.0.0/24 10.0.0.0/24 interface /Common/external connected
127.1.1.0/24 127.1.1.0/24 interface tmm connected
ff02:ffc::/64 ff02:ffc::/64 interface /Common/vlan1 connected
fe80::%vlan4092/64 fe80::%vlan4092/64 interface /Common/vlan1 connected
fe80::%vlan4094/64 fe80::%vlan4094/64 interface /Common/external connected
fe80::%vlan4093/64 fe80::%vlan4093/64 interface /Common/internal connected
ff02:fff::/64 ff02:fff::/64 interface tmm_bp connected
fe80::%vlan4095/64 fe80::%vlan4095/64 interface tmm_bp connected
fe80::/64 fe80::/64 interface /Common/cp_portal connected
fe80::/64 fe80::/64 interface /Common/cp_network connected
fe80::/64 fe80::/64 interface /Common/cp_full connected
fe80::/64 fe80::/64 interface /Common/socks-tunnel connected
fe80::/64 fe80::/64 interface /Common/http-tunnel connected
ff02:fff::/64 ff02:fff::/64 interface /Common/tmm_bp connected
fe80::%vlan4095/64 fe80::%vlan4095/64 interface /Common/tmm_bp connected
ff02:ffd::/64 ff02:ffd::/64 interface /Common/internal connected
ff02:ffe::/64 ff02:ffe::/64 interface /Common/external connected
ff02::/64 ff02::/64 interface tmm connected
fe80::/64 fe80::/64 interface tmm connected
[root@LABBIGIP1:Active:Disconnected] config netstat -rn
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 127.1.1.253 0.0.0.0 UG 0 0 0 tmm
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 external
127.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 tmm
127.7.0.0 127.1.1.253 255.255.0.0 UG 0 0 0 tmm
127.20.0.0 0.0.0.0 255.255.0.0 U 0 0 0 tmm_bp
172.16.0.0 0.0.0.0 255.255.255.0 U 0 0 0 internal
192.168.255.0 0.0.0.0 255.255.255.0 U 0 0 0 mgmt
[root@LABBIGIP1:Active:Disconnected] config tmsh show net route
----------------------------------------------------------------------------------------
Net::Routes
Name Destination Type NextHop Origin
----------------------------------------------------------------------------------------
route_default default pool /Common/gateway_pool static 1500
127.20.0.0/16 127.20.0.0/16 interface tmm_bp connected
172.16.0.0/24 172.16.0.0/24 interface /Common/internal connected
10.0.0.0/24 10.0.0.0/24 interface /Common/external connected
127.1.1.0/24 127.1.1.0/24 interface tmm connected
ff02:ffc::/64 ff02:ffc::/64 interface /Common/vlan1 connected
fe80::%vlan4092/64 fe80::%vlan4092/64 interface /Common/vlan1 connected
fe80::%vlan4094/64 fe80::%vlan4094/64 interface /Common/external connected
fe80::%vlan4093/64 fe80::%vlan4093/64 interface /Common/internal connected
ff02:fff::/64 ff02:fff::/64 interface tmm_bp connected
fe80::%vlan4095/64 fe80::%vlan4095/64 interface tmm_bp connected
fe80::/64 fe80::/64 interface /Common/cp_portal connected
fe80::/64 fe80::/64 interface /Common/cp_network connected
fe80::/64 fe80::/64 interface /Common/cp_full connected
fe80::/64 fe80::/64 interface /Common/socks-tunnel connected
fe80::/64 fe80::/64 interface /Common/http-tunnel connected
ff02:fff::/64 ff02:fff::/64 interface /Common/tmm_bp connected
fe80::%vlan4095/64 fe80::%vlan4095/64 interface /Common/tmm_bp connected
ff02:ffd::/64 ff02:ffd::/64 interface /Common/internal connected
ff02:ffe::/64 ff02:ffe::/64 interface /Common/external connected
ff02::/64 ff02::/64 interface tmm connected
fe80::/64 fe80::/64 interface tmm connected
[root@LABBIGIP1:Active:Disconnected] config
netstat is from Linux point of view, tmsh is from TMM point of view.
First 2 commands when using gateway (single IP), and last 2 when using pool.
"Is it possible ?"
Yes, should work.