Public bug reported:
When running wg-quick, I always get the below with my wireless LAN and
sometimes with my wired LAN:
[#] ip link add dev tun0 type wireguard
[#] wg setconf tun0 /dev/fd/63
[#] ip -4 address add 10.66.218.109/32 dev tun0
[#] ip -6 address add fc00:bbbb:bbbb:bb01::3:da6c/128 dev tun0
[#] ip link set mtu 1420 up dev tun0
[#] resolvconf -a tun0 -m 0 -x
[#] wg set tun0 fwmark 51820
[#] ip -6 rule add not fwmark 51820 table 51820
[#] ip -6 rule add table main suppress_prefixlength 0
[#] ip -6 route add ::/0 dev tun0 table 51820
Error: Nexthop device is not up.
[#] resolvconf -d tun0 -f
[#] ip -6 rule delete table 51820
[#] ip -6 rule delete table main suppress_prefixlength 0
[#] ip link delete dev tun0
This sometimes affects ipv4 and sometimes ipv6. The result is always
that the interface is deleted.
Fix: There is a simple fix and it is to introduce a small delay before
addition of route in the /usr/bin/wg-quick:
add_route() {
local proto=-4
[[ $1 == *:* ]] && proto=-6
[[ $TABLE != off ]] || return 0
sleep 1 # add this
if [[ -n $TABLE && $TABLE != auto ]]; then
cmd ip $proto route add "$1" dev "$INTERFACE" table "$TABLE"
elif [[ $1 == */0 ]]; then
add_default "$1"
else
[[ -n $(ip $proto route show dev "$INTERFACE" match "$1"
2>/dev/null) ]] || cmd ip $proto route add "$1" dev "$INTERFACE"
fi
}
Or as a patch:
#!/bin/bash
test -f /usr/bin/wg-quick.orig || patch -b /usr/bin/wg-quick <<'EOF'
171c171,173
<
---
>
> sleep 1
>
EOF
$ lsb_release -rd
Description: Ubuntu 26.04 LTS
Release: 26.04
$ apt-cache policy wireguard
wireguard:
Installed: 1.0.20250521-1ubuntu1
Candidate: 1.0.20250521-1ubuntu1
Version table:
*** 1.0.20250521-1ubuntu1 500
500 http://archive.ubuntu.com/ubuntu resolute/universe amd64 Packages
100 /var/lib/dpkg/status
** Affects: wireguard (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2160644
Title:
wg-quick: Error: Nexthop device is not up.
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