Default route WRT3200ACM

Installing and Using OpenWrt
1

Hello community,

I've been struggling with the default route on my WRT3200ACM.
I installed OpenWrt on my Linksys WRT3200ACM, configured extroot (using https://openwrt.org/docs/guide-user/additional-software/extroot_configuration?s[]=extroot as reference) and changed the IP address of it (using [Solved] How to correctly change router LAN's IP address? as reference).
As far as I remember I did the exakt same procedure on my other two WRT3200ACM, but with this WRT3200ACM I have a problem with the default route - there is none.
Problematic WRT3200ACM (route):

root@OpenWrt:~# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.1.1.0        *               255.255.255.0   U     0      0        0 br-lan
10.10.20.0      10.10.40.1      255.255.255.0   UG    0      0        0 eth1.2 (static route)
10.10.40.0      10.10.40.1      255.255.255.0   UG    0      0        0 eth1.2 (static route)
root@OpenWrt:~#

Working WRT3200ACM (route):

root@OpenWrt:~# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         10.255.255.1    0.0.0.0         UG    0      0        0 eth1.2
10.10.10.0      10.255.255.2    255.255.255.0   UG    0      0        0 eth1.2 (static route)
10.10.20.0      10.255.255.2    255.255.255.0   UG    0      0        0 eth1.2 (static route)
10.10.30.0      10.255.255.2    255.255.255.0   UG    0      0        0 eth1.2 (static route)
10.10.40.0      *               255.255.255.0   U     0      0        0 br-lan
10.255.255.0    *               255.255.255.0   U     0      0        0 eth1.2
root@OpenWrt:~#

How can I set a default route to take? Trying to set the default route manually did not work:

root@OpenWrt:~# route add default gw 10.10.40.1           
route: SIOCADDRT: Network unreachable
root@OpenWrt:~# 
root@OpenWrt:~# ip route add default via 10.10.40.1
ip: RTNETLINK answers: Network unreachable
root@OpenWrt:~#

My /etc/config/network:

root@OpenWrt:~# cat /etc/config/network 

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fdaf:a159:a8fd::/48'

config interface 'lan'
        option type 'bridge'
        option ifname 'eth0.1'
        option proto 'static'
        option ipaddr '10.1.1.1'
        option netmask '255.255.255.0'
        option ip6assign '60'

config interface 'wan'
        option ifname 'eth1.2'
        option proto 'static'
        option ipaddr '10.10.40.147'
        option netmask '255.255.255.0'
        option gateway '10.10.40.1'
        option broadcast '10.10.40.255'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option ports '0 1 2 3 5t'

config switch_vlan
        option device 'switch0'
        option vlan '2'
        option ports '4 6t'

config route
        option target '10.10.20.0'
        option netmask '255.255.255.0'
        option gateway '10.10.40.1'
        option interface 'wan'

config route
        option interface 'wan'
        option target '10.10.40.0'
        option netmask '255.255.255.0'
        option gateway '10.10.40.1'

root@OpenWrt:~#

On the working WRT3200ACM it looks basically the same:

root@OpenWrt:~# cat /etc/config/network 

config interface 'loopback'
        option ifname 'lo'
        option proto 'static'
        option ipaddr '127.0.0.1'
        option netmask '255.0.0.0'

config globals 'globals'
        option ula_prefix 'fd89:d980:8713::/48'

config interface 'lan'
        option type 'bridge'
        option ifname 'eth0.1'
        option proto 'static'
        option ipaddr '10.10.40.1'
        option netmask '255.255.255.0'

config interface 'wan'
        option ifname 'eth1.2'
        option proto 'static'
        option delegate '0'
        option netmask '255.255.255.0'
        option dns '10.10.20.6'
        option ipaddr '10.255.255.3'
        option broadcast '10.255.255.255'
        option gateway '10.255.255.1'

config switch
        option name 'switch0'
        option reset '1'
        option enable_vlan '1'

config switch_vlan
        option device 'switch0'
        option vlan '1'
        option ports '0 1 2 3 5t'

config switch_vlan
        option device 'switch0'
        option vlan '2'
        option ports '4 6t'

config route
        option interface 'wan'
        option target '10.10.10.0'
        option netmask '255.255.255.0'
        option gateway '10.255.255.2'

config route
        option interface 'wan'
        option target '10.10.20.0'
        option netmask '255.255.255.0'
        option gateway '10.255.255.2'

config route
        option interface 'wan'
        option target '10.10.30.0'
        option netmask '255.255.255.0'
        option gateway '10.255.255.2'

root@OpenWrt:~#

Has anybody any clue?

Cheers,
Steffen

2

The issue is here:

config route
        option interface 'wan'
        option target '10.10.40.0'
        option netmask '255.255.255.0'
        option gateway '10.10.40.1'

This is redundant, as it matches the definition on your WAN interface; but it's also confusing, as you are telling the router that it needs to use a gateway at 10.10.40.1 to reach nodes on the 10.10.40.0 network.

6 Likes
3

You don't need the static routes on the problematic router.
10.10.40.1 is defined in WAN interface as default gateway, hence everything not destined to the LAN will go there.

3 Likes
4

Hello eduperez,

thank you very much! You just saved me another day of figuring out, why it's not working.
I assume this happened due to a copy/paste error while copying the configuration file from the working WRT3200ACM.

Have a nice weekend!

Cheers,
Steffen

3 Likes
5

Hello trendy,

thank you for your input - you are absolutely right.
I added this route just in preperation for it's usage (I am configuring it to have it as actual uplink and the default route will then point "out into the internet", which obviously won't work).

Have a nice weekend!

Cheers,
Steffen

1 Like
6

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