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I have a Router has 4 ethernet ports, eth0 to eth3, with OpenWRT inside and such configurations:

  • Interface lan1 involves only eth0, IP address 10.10.0.1/16
  • Interface lan2 involves only eth1, IP address 10.11.0.1/16

The route table auto generated by OpenWRT is:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.10.0.0       *               255.255.0.0     U     0      0        0 eth0
10.11.0.0       *               255.255.0.0     U     0      0        0 eth1

So as you could see these two interfaces are different subnets.

When I ssh into the router I could ping both devices on 10.10.0.0/16 and 10.11.0.0/16. But when I was going to ping a device from 10.11.0.0/16 to 10.10.0.0/16 I only got bytes from 10.11.0.1: Destination Port Unreachable.

What I want to do is: be able to ping 10.10.0.0 from 10.11.0.0 and vice versa.

How could I achieve this?

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  • Does the router have an IP address set on eth0 and eth1? Also, make sure there isn't a firewall running on the device you are attempting to ping.
    – Curtis
    Commented Jun 12, 2016 at 3:48
  • @Curtis The IP for eth0 is 10.10.0.1 and for eth1 is 10.11.0.1. The iptables is running but I've changed all the rules to ACCEPT
    – jayatubi
    Commented Jun 12, 2016 at 3:50
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    Try disabling IP tables completely and see if that helps (as suggested here superuser.com/questions/587067/… )
    – Curtis
    Commented Jun 12, 2016 at 4:03
  • @Curtis Thanks for the post. I will check that.
    – jayatubi
    Commented Jun 12, 2016 at 4:35
  • @Curtis I just follow the hint from that post to add new zone forwarding rules and now these two subjects were able to ping each other.
    – jayatubi
    Commented Jun 12, 2016 at 22:46

1 Answer 1

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If the two devices on 10.10.0.0/16 and 10.11.0.0/16 are Windows devices, I don't believe they will accept inbound ICMP echo requests from a different subnet. You will likely have to create a custom rule through the Windows Firewall: https://technet.microsoft.com/en-us/library/cc972926(v=ws.10).aspx

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  • Thanks for your answer. But all my devices are running Linux
    – jayatubi
    Commented Jun 12, 2016 at 12:46
  • Ok, I guess check iptables on your two Linux devices and make sure they accept ICMP echo requests.
    – Mark Riddell
    Commented Jun 12, 2016 at 14:23
  • I found the reason is about openwrt zone forwarding rules. No need to make changes on devices.
    – jayatubi
    Commented Jun 12, 2016 at 22:48

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