Bifurcation of packets depending on LAN and WAN traffic and forwarding them to different gateways

Arkajyoti

2/24/23, 9:20 AM

The current scenario of my interfaces with their IPs and Gateways are as follows.

PC1 ->

   IF11  192.168.1.100     GW  192.168.1.220

PC2 ->

   IF21  192.168.1.210     GW  192.168.1.1
   IF22  192.168.1.220     GW  192.168.1.250

PC3 ->

   IF31  192.168.1.250     GW  192.168.1.1
   IF32   x.x.x.x

The way I want my network traffic to move is as follows:

In PC1 ->

All traffic from PC1 will move to PC2 IF22.

In PC2 ->

All LAN traffic will be forwarded to PC2 IF21 who in turn forwards them to my gateway.

All WAN traffic will be forwarded to PC3 IF31.

In PC3 ->

IF32 is a VPN tunnel interface. I already configured this PC such a way that all traffic coming to IF31 is forwarded to IF32 to communicate with WAN. The commands used in PC3 is as follows:

echo 1 >/proc/sys/net/ipv4/ip_forward
iptables -A FORWARD -i IF31 -o IF32 -j ACCEPT
iptables -A FORWARD -i IF32 -o IF31 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o IF32 -j MASQUERADE
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf

Now I want help in configuring PC2 in such a way that it identifies the packets (maybe via destination?) and forwards them as needed. Or maybe if it is possible to use only 1 interface in PC2 and apply policy rules on it for forwarding to different gateways?

LAN destination network can be for example 192.168.20.0/24 and 192.168.30.0/24

0 + 0

iptables

networking

routing

nat

20.04

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Bifurcation of packets depending on LAN and WAN traffic and forwarding them to different gateways

TH: การแบ่งแพ็กเก็ตขึ้นอยู่กับทราฟฟิก LAN และ WAN และส่งต่อไปยังเกตเวย์ต่างๆ

RO: Bifurcarea pachetelor în funcție de traficul LAN și WAN și redirecționarea acestora către diferite gateway-uri

RU: Раздвоение пакетов в зависимости от трафика LAN и WAN и перенаправление их на разные шлюзы

VI: Phân nhánh các gói tùy thuộc vào lưu lượng mạng LAN và WAN và chuyển tiếp chúng đến các cổng khác nhau

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