Wireguard tunnel freezes TL-WR841N router network

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mjb2
DD-WRT Novice


Joined: 10 Jan 2010
Posts: 2
PostPosted: Mon Mar 04, 2024 9:08    Post subject: Wireguard tunnel freezes TL-WR841N router network Reply with quote
When I configure a Wireguard tunnel on a TL-WR841N router with a recent dd-wrt firmware, a few seconds after the router establishes the Wireguard connection the router can no longer be reached via any interface. The LEDs still show activity.

After some analysis I found out that this is caused by the command "ip -6 route flush cache" which is invoked in the eop-tunnel-raip.sh script. This command somehow kills the network on this router model. This router has only 4MB flash memory and uses busybox for the ip command.

As a workaround you can add the following as Startup commands under Administration/Commands:

Code:
cp /usr/bin/eop-tunnel-raip.sh /tmp/eop-tunnel-raip.sh
sed -i '/ip -6 route flush cache/d' /tmp/eop-tunnel-raip.sh
mount -o bind /tmp/eop-tunnel-raip.sh /usr/bin/eop-tunnel-raip.sh


This deletes the line with the problematic "ip -6 route flush cache" command from the script. After this change wireguard works well also on this router.

Regards,
Max

Basic information:
• Current DD-WRT build number in use: DD-WRT v3.0-r55109 std (02/09/24)
• Router brand / model and hardware version: TPLINK TL-WR841N (v8 and v9)
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12922
Location: Netherlands
PostPosted: Tue Mar 05, 2024 15:40    Post subject: Reply with quote
Adding WireGuard to these 4 MB routers was an afterthought and the router is probably missing some "essential" things.
There probably is no room to add these so I will add a workaround.

Edit: could/should be solved in next public beta
_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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