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→L2TP Ethernet Pseudowires: Added l2tpv3-cisco.sh information
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==Between Cisco and Linux==
You can use L2TPv3 between Cisco and Linux utilizing the following script from Leif Sawyer.
*Script source: https://github.com/akhepcat/Miscellaneous
*Direct download link: https://raw.githubusercontent.com/akhepcat/Miscellaneous/master/l2tpv3-cisco.sh
This script will bring up the Linux side of the connection and generate the Cisco side config.
===Configuration===
*Edit the variables '''TUNNEL_ID''', '''SESSION_ID''', '''LOCAL''', and '''REMOTE''' to values that are suitable for your environment.
===Commands===
*Start the tunnel with '''l2tpv3-cisco.sh start'''
*Stop the tunnel with '''l2tpv3-cisco.sh stop'''
*Restart the tunnel with '''l2tpv3-cisco.sh restart'''
*Generate Cisco config with '''l2tpv3-cisco.sh config'''
===l2tpv3-cisco.sh===
#!/bin/bash
# (c) 2020 Leif Sawyer
# License: GPL 3.0 (see https://github.com/akhepcat/)
# Permanent home: https://github.com/akhepcat/Miscellaneous/
# Direct download: https://raw.githubusercontent.com/akhepcat/Miscellaneous/master/l2tpv3-cisco.sh
#
# using l2tpV3 between linux and cisco is sometimes weird.
# this script is how I get the linux side up.
# This will also auto-generate the cisco-side config.
################################
TUNNEL_ID=101
REMOTE_TUNNEL_ID=${TUNNEL_ID}
SESSION_ID=101
REMOTE_SESSION_ID=${SESSION_ID}
LOCAL=10.1.1.1
REMOTE=10.100.100.1
################################
PATH=/sbin:$PATH
IPV=$(ip -V | sed 's/.*-ss//')
if [ ${IPV:-0} -lt 130716 ]
then
echo "Please install a newer version of iproute2 ( 3.10 or (>= 2013-07-16))"
echo " from https://www.kernel.org/pub/linux/utils/net/iproute2/"
exit
fi
modules() {
for module in l2tp_core l2tp_netlink l2tp_eth l2tp_ip
do
modprobe $i
done
}
tunnel_up() {
ip l2tp add tunnel remote ${REMOTE} local ${LOCAL} tunnel_id $TUNNEL_ID peer_tunnel_id $REMOTE_TUNNEL_ID encap ip
ip l2tp add session tunnel_id $TUNNEL_ID session_id $SESSION_ID peer_session_id $REMOTE_SESSION_ID l2spec_type none
ip link set l2tpeth0 up mtu 1488
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1448:1536 -j TCPMSS --set-mss 1448
}
tunnel_down() {
iptables -D FORWARD -p tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1448:1536 -j TCPMSS --set-mss 1448
ip link set l2tpeth0 down
ip l2tp del session tunnel_id $TUNNEL_ID session_id $SESSION_ID
ip l2tp del tunnel tunnel_id $TUNNEL_ID
}
cisco_config() {
cat <<EOF
! Global config
!
pseudowire-class Linux-L2TP
encapsulation l2tpv3
interworking ethernet
protocol none
ip local interface $REMOTE
ip pmtu
ip tos value 41
ip ttl 100
!
! Interface config
!
interface \$L2interface
xconnect $LOCAL $REMOTE_TUNNEL_ID encapsulation l2tpv3 manual pw-class Linux-L2TP
l2tp id $SESSION_ID $REMOTE_SESSION_ID
EOF
}
case $1 in
start|up) tunnel_up
;;
stop|down) tunnel_down
;;
restart|reload) stop; start
;;
config|cisco|cisco-config) cisco_config
;;
*) echo "$0 (start|up || stop|down || restart|reload || config|cisco|cisco-config)"
;;
esac
===Linux===
===Linux===
Create an L2TP ethernet pseudowires connection using the Linux kernel's L2TP drivers along with the ip utility.
Create an L2TP ethernet pseudowires connection using the Linux kernel's L2TP drivers along with the ip utility.