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Only add ipv6 route if available and set MTU directly #8

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Sep 2, 2022
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Only add ipv6 route if available and set MTU directly #8

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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,8 @@ expected values are set by default, most with dummy default values.
WireGuard interface. For a namespaced VPN, where the goal is to force all
traffic through the VPN, the catch-all value `0.0.0.0/0,::0/0` is probably
correct.
- `WIREGUARD_INITIAL_MTU`:
MTU of the wireguard interface. Choosing too large a value risks packet loss.
- `WIREGUARD_IP_ADDRESSES`:
Comma-separated list of static IP addresses to assign to the WireGuard
interface. As far as I know, WireGuard does not currently support DHCP or any
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7 changes: 5 additions & 2 deletions bin/namespaced-wireguard-vpn-interface
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Expand Up @@ -7,7 +7,7 @@ die() {

case "$1" in
up)
ip link add "$WIREGUARD_NAME" type wireguard || die
ip link add "$WIREGUARD_NAME" mtu $WIREGUARD_INITIAL_MTU type wireguard || die

wg set "$WIREGUARD_NAME" \
private-key <(echo "$WIREGUARD_PRIVATE_KEY") \
Expand All @@ -26,7 +26,10 @@ case "$1" in

# Add default routes for IPv4 and IPv6
ip -n "$NETNS_NAME" -4 route add default dev "$WIREGUARD_NAME" || die
ip -n "$NETNS_NAME" -6 route add default dev "$WIREGUARD_NAME" || die
if ip -o -6 -a | grep -q "$WIREGUARD_NAME"
then
ip -n "$NETNS_NAME" -6 route add default dev "$WIREGUARD_NAME" || die
fi
;;

down)
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6 changes: 6 additions & 0 deletions conf/namespaced-wireguard-vpn.conf
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Expand Up @@ -20,6 +20,12 @@ WIREGUARD_ALLOWED_IPS=0.0.0.0/0,::0/0
# interface
WIREGUARD_IP_ADDRESSES=10.0.0.1/32,fd12:3456:789a:1::1/128

# Assuming a sane VPN provider:
# IPv4: 1440
# IPv6: 1420
# If using PPPoE(typically DSL) -=8
WIREGUARD_INITIAL_MTU=1420

# Name of the init-facing tunnel interface
TUNNEL_INIT_NAME=veth-vpn0

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