Routing between 2 NIC's

[BOFFBOY]

Hello fellow Linux gurus,

Seeking for some assistance on this.
I have NIC1 on 192.168.100.1/24 network with gateway set as 192.168.100.254 < this cant be changed. with a few PC’s connected to this.

And NIC2 on 10.10.10.1/24 with a few devices on this.

I want to be able to ping from PC1 connected to NIC1 on 192.168.100.100/24 to devices connected to NIC2 on 10.10.10.100/24

Could someone advise on the route settings I need to configure to make this work please ?
 

[djurny]

Hi there,

Not sure if your question is complete, are both NIC1 and NIC2 in the same PC1 ? (NIC being network interface controller/card.)

If NIC1 and NIC2 are both in the same computing node, the routes should be there already, if the configuration is plain and not something funky.

Can you share the output of `ip a s` and `ip route` ?

Also, do you have any firewall enabled?

Gr,

[BOFFBOY]

Hi there,

the 2 NICs are on my RPi Armbian.

 

ip route output. > modified it abit to match but concept is below.
default via 10.10.10.254 dev enp4s0 proto static metric 100
169.254.0.0/16 dev enp4s0 scope link metric 1000
192.168.100.0/24 dev eth0 proto kernel scope link src 192.168.100.10 metric 101
10.10.10.10/24 dev enp4s0 proto kernel scope link src 10.10.10.2 metric 100

 

I have only PC1 connected to NIC1 with 192.168.100.101 GW - 192.168.100.254

This PC1 can NOT be changed.

Device1 on NIC2 10.10.10.100/24 < this have no Gateway as its only a slave device.

I need to reach Device1 on NIC2 from the PC1 on NIC1..how is this achieved?

I tried /etc/sysctl.conf

net.ipv4.ip_forward=1
still missing something…

I failed to mention is that I can only modify settings within the Linux box containing the 2 NICs.

I need some sort of interlinking NIC1 on 192.168 to forward packets to 10.10 network…

Edited 2 hours ago by BOFFBOY