8000 feat: add custom MTU option to OpenVPN setup by Knogle · Pull Request #1300 · angristan/openvpn-install · GitHub
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feat: add custom MTU option to OpenVPN setup #1300

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feat: add custom MTU option to OpenVPN setup #1300

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26 changes: 26 additions & 0 deletions openvpn-install.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -355,6 +355,22 @@ function installQuestions() {
PROTOCOL="tcp"
;;
esac
echo ""
echo "Do you want to set a custom MTU for the VPN interface?"
echo " 1) No, keep default"
echo " 2) Yes, specify a custom MTU"
until [[ $MTU_CHOICE =~ ^[1-2]$ ]]; do
read -rp "Selection [1-2]: " -e -i 1 MTU_CHOICE
done
if [[ $MTU_CHOICE == "2" ]]; then
until [[ $MTU =~ ^[0-9]+$ ]] && [ "$MTU" -ge 576 ] && [ "$MTU" -le 1500 ]; do
read -rp "Desired MTU (576–1500): " MTU
done
CUSTOM_MTU="y"
else
CUSTOM_MTU="n"
fi

echo ""
echo "What DNS resolvers do you want to use with the VPN?"
echo " 1) Current system resolvers (from /etc/resolv.conf)"
Expand Down Expand Up @@ -823,6 +839,11 @@ keepalive 10 120
topology subnet
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt" >>/etc/openvpn/server.conf
# Only set custom MTU if requested by user
if [[ $CUSTOM_MTU == "y" ]]; then
echo "tun-mtu $MTU" >>/etc/openvpn/server.conf
echo "mssfix $((MTU - 40))" >>/etc/openvpn/server.conf
fi

# DNS resolvers
case $DNS in
Expand Down Expand Up @@ -1086,6 +1107,11 @@ tls-cipher $CC_CIPHER
ignore-unknown-option block-outside-dns
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
verb 3" >>/etc/openvpn/client-template.txt
# Only set custom MTU if requested by user
if [[ $CUSTOM_MTU == "y" ]]; then
echo "tun-mtu $MTU" >>/etc/openvpn/client-template.txt
echo "mssfix $((MTU - 40))" >>/etc/openvpn/client-template.txt
fi

if [[ $COMPRESSION_ENABLED == "y" ]]; then
echo "compress $COMPRESSION_ALG" >>/etc/openvpn/client-template.txt
Expand Down
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