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hwdsl2 avatar hwdsl2 commented on May 20, 2024 1

@chiragrajk Hello! For IKEv2 only mode, some IPTables rules are not required: 1. Rules related to UDP port 1701. 2. Rules related to "ppp+". 3. Rule containing "L2TP_NET". Removing them is not necessary for IKEv2 only mode to work, but you can if you want. Note that the IPTables commands are numbered, so you will need to update the rule numbers accordingly.

The relevant part of the script is:

setup-ipsec-vpn/vpnsetup_ubuntu.sh

Lines 576 to 614 in b7b3fc3

update_iptables() {
bigecho "Updating IPTables rules..."
IPT_FILE=/etc/iptables.rules
IPT_FILE2=/etc/iptables/rules.v4
ipt_flag=0
if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE"; then
ipt_flag=1
fi
ipi='iptables -I INPUT'
ipf='iptables -I FORWARD'
ipp='iptables -t nat -I POSTROUTING'
res='RELATED,ESTABLISHED'
if [ "$ipt_flag" = 1 ]; then
service fail2ban stop >/dev/null 2>&1
iptables-save > "$IPT_FILE.old-$SYS_DT"
$ipi 1 -p udp --dport 1701 -m policy --dir in --pol none -j DROP
$ipi 2 -m conntrack --ctstate INVALID -j DROP
$ipi 3 -m conntrack --ctstate "$res" -j ACCEPT
$ipi 4 -p udp -m multiport --dports 500,4500 -j ACCEPT
$ipi 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
$ipi 6 -p udp --dport 1701 -j DROP
$ipf 1 -m conntrack --ctstate INVALID -j DROP
$ipf 2 -i "$NET_IFACE" -o ppp+ -m conntrack --ctstate "$res" -j ACCEPT
$ipf 3 -i ppp+ -o "$NET_IFACE" -j ACCEPT
$ipf 4 -i ppp+ -o ppp+ -j ACCEPT
$ipf 5 -i "$NET_IFACE" -d "$XAUTH_NET" -m conntrack --ctstate "$res" -j ACCEPT
$ipf 6 -s "$XAUTH_NET" -o "$NET_IFACE" -j ACCEPT
$ipf 7 -s "$XAUTH_NET" -o ppp+ -j ACCEPT
iptables -A FORWARD -j DROP
$ipp -s "$XAUTH_NET" -o "$NET_IFACE" -m policy --dir out --pol none -j MASQUERADE
$ipp -s "$L2TP_NET" -o "$NET_IFACE" -j MASQUERADE
echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
iptables-save >> "$IPT_FILE"
if [ -f "$IPT_FILE2" ]; then
conf_bk "$IPT_FILE2"
/bin/cp -f "$IPT_FILE" "$IPT_FILE2"
fi
fi
}

from setup-ipsec-vpn.

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