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better default_interface detection

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adrian-hoasted 2022-04-30 10:34:33 +02:00
parent feaa1a96fe
commit 4c2c704f75
1 changed files with 11 additions and 1 deletions
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12
networking/network-configure.sh
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@ -70,7 +70,17 @@ fi
# Auto detect the existing network settings... this is all for ipv4
echo "Auto detecting existing network settings"
default_interface="$(ip route | awk '/default/ { print $5 }' | grep -v "vmbr")"
# Detect primary interface using the default route
default_interface="$(ip -o route get 8/32 | grep -o 'dev [^ ]*' | xargs | cut -d' ' -f 2)"
if [[ $default_interface == eth* ]] ; then
# Search for the alt name, ie enp0s1 instead of eth0
default_interface_altname="$(ip link show "${default_interface}" | grep -o 'altname [^ ]*' | xargs | cut -d' ' -f 2)"
# Assign the alt name if present
if [ -n "$default_interface_altname" ] && [ "$default_interface_altname" != " " ]; then
default_interface="$default_interface_altname"
fi
fi
if [ "$default_interface" == "" ]; then
#filter the interfaces to get the default interface and which is not down and not a virtual bridge
default_interface="$(ip link | sed -e '/state DOWN / { N; d; }' | sed -e '/veth[0-9].*:/ { N; d; }' | sed -e '/vmbr[0-9].*:/ { N; d; }' | sed -e '/tap[0-9].*:/ { N; d; }' | sed -e '/lo:/ { N; d; }' | head -n 1 | cut -d':' -f 2 | xargs)"