вот с TANK и роутером asus см. приложения
iptables -save -ругается на команду

#ip a
1: lo: <LOOPBACK,MULTICAST,UP,10000> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 20:cf:30:ce:22:4d brd ff:ff:ff:ff:ff:ff
inet 10.20.231.134/24 brd 10.20.231.255 scope global eth0
3: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 20:cf:30:ce:22:4d brd ff:ff:ff:ff:ff:ff
4: vlan1@eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
link/ether 20:cf:30:ce:22:4d brd ff:ff:ff:ff:ff:ff
11: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
link/ether 20:cf:30:ce:22:4d brd ff:ff:ff:ff:ff:ff
inet 192.168.1.1/24 brd 192.168.1.255 scope global br0
# ip r
10.20.231.1 dev eth0 scope link
10.20.231.0/24 dev eth0 proto kernel scope link src 10.20.231.134
192.168.2.0/24 via 192.168.1.2 dev br0 metric 3
192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.1
5.0.0.0/8 via 192.168.1.2 dev br0 metric 3
127.0.0.0/8 dev lo scope link
default via 10.20.231.1 dev eth0
# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.20.231.1 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
10.20.231.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.2.0 192.168.1.2 255.255.255.0 UG 3 0 0 br0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
5.0.0.0 192.168.1.2 255.0.0.0 UG 3 0 0 br0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.20.231.1 0.0.0.0 UG 0 0 0 eth0
TANK:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:e0:52:c3:91:ad brd ff:ff:ff:ff:ff:ff
inet 192.168.1.2/24 brd 192.168.1.255 scope global eth0
inet6 fe80::2e0:52ff:fec3:91ad/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
link/ether 00:80:48:49:2c:0b brd ff:ff:ff:ff:ff:ff
inet 192.168.2.2/24 brd 192.168.2.255 scope global eth1
inet6 fe80::280:48ff:fe49:2c0b/64 scope link
valid_lft forever preferred_lft forever
4: ham0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1404 qdisc pfifo_fast state UNKNOWN qlen 500
link/ether 7a:79:05:37:e1:f2 brd ff:ff:ff:ff:ff:ff
inet 5.55.225.242/8 brd 5.255.255.255 scope global ham0
inet6 2620:9b::537:e1f2/96 scope global
valid_lft forever preferred_lft forever
inet6 fe80::7879:5ff:fe37:e1f2/64 scope link
valid_lft forever preferred_lft forever
TANK:~# ip r
default via 192.168.1.1 dev eth0 metric 100
5.0.0.0/8 dev ham0 proto kernel scope link src 5.55.225.242
192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.2
192.168.2.0/24 dev eth1 proto kernel scope link src 192.168.2.2
TANK:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0
5.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 ham0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1