EdgeOS GRE/IPsec config example
This is an example configuration derived from the config used on a peering router in AS64746. It was created using EdgeOS version 1.5.0alpha1 on an EdgeRouter Lite.
Features
- Zone-based firewall
- BGP prefix filtering and route summarization
- GRE/IPsec tunnel in transport mode with “plainrsa” public key authentication
- TCP MSS clamping to avoid fragmentation
Setup
This configuration assumes that both peers have static public IPs.
You’ll need to generate a public/private keypair for your router if you intend to use “plainrsa” authentication for your IPsec connections. The local public key listed in the output is what you’ll send to your peer.
ryan@edge1:~$ generate vpn rsa-key bits 4096
ryan@edge1:~$ show vpn ike rsa-keys
Local public key (/config/ipsec.d/rsa-keys/localhost.key):
0sAQPNdF370ZEbN+kZUJQ10qnBlZujrg39ujfk20ILTjELksOIdJw/4jiU1MfpqFDKuB/XxERwJQp2POsFyV/n76jAgxIYBfFYfuaBcIH1rdNQtDhCnkmWzlueRXGEsz0Af79n8TKyQ9otzNhJ2cPE1CWCJbKqbIUN3piviLgGlItWNeya+Tl3Oj3ZfEVwr1QOvUAw32+m4L8T9jf1vqSlOTHpRpxxPWBrLEzstk0FOcZISji2JBpDOCU8Kpyyf74JM+LxsOIHwmS15b6iFZR3U9KZLqbbd0dSy/cM8P4XjrwM5UMyRDjrLqvuA/K/33BgtnxdQR3e9DJoYH3Qr8eRgSkR+jHyq06LvgHkHbMvrEjUnc3n8bg+YfR4oyJpIWsKjfIXmN1Q51KzxAPIAww+YSYUYtamSsQsspVAtMIQqR4e0r1In1qyoSn8VCPlksNMWpqYHbSjDo5HJYoSwxf2epzMtCvhenn0OuiH0xlgzziA+wBi6txksTMvJYcPJYnBVR2NIBjkWftOfmkY+rKMozViGjyd6kB7C8lqd8W7Ha5Ds2WxIY22DM3HcYH/zTp9z2xbuMOsbIgib/Y12Kh0wHyCz0lzFvs+d6CZwinyIXNKB/Vo4iiwT5luL5mGqf3pZx4zB+30GYSs/6MaELRF9BxD7tfqYCkOLXUtxyZ4Pdl2sw==
If your peer sends you a key in PEM format (starts with -----BEGIN PUBLIC KEY-----), you’ll need to convert it to the format used by EdgeOS (begins with 0s) in order to insert it into the configuration. See this forum post for a script to convert between the two key formats.
Configuration
firewall {
all-ping enable
broadcast-ping disable
ipv6-receive-redirects disable
ipv6-src-route disable
ip-src-route disable
log-martians enable
name DN42-to-Local {
default-action reject
rule 10 {
action accept
description Established/Related
state {
established enable
related enable
}
}
rule 20 {
action accept
description ICMP
protocol icmp
}
rule 30 {
action accept
description BGP
destination {
port bgp
}
protocol tcp
state {
new enable
}
tcp {
flags SYN,!ACK,!FIN,!RST
}
}
}
name DN42-to-LAN {
default-action reject
rule 10 {
action accept
description Established/Related
state {
established enable
related enable
}
}
rule 20 {
action accept
description ICMP
protocol icmp
}
}
name WAN-to-Local {
default-action drop
rule 10 {
action accept
description Established/Related
state {
established enable
related enable
}
}
rule 20 {
action accept
description ICMP
protocol icmp
}
rule 30 {
action accept
description "SSH Management"
destination {
port 22
}
protocol tcp
state {
new enable
}
tcp {
flags SYN,!ACK,!FIN,!RST
}
}
rule 40 {
action accept
description IKE
destination {
port 500,4500
}
protocol udp
}
rule 50 {
action accept
description IPSEC/ESP
protocol esp
}
rule 60 {
action accept
description "GRE over IPsec"
ipsec {
match-ipsec
}
protocol gre
}
}
name established-only {
default-action drop
rule 10 {
action accept
description Established/Related
state {
established enable
related enable
}
}
}
name allow-all-v4 {
default-action accept
}
options {
mss-clamp {
interface-type tun
mss 1300
}
}
receive-redirects disable
send-redirects enable
source-validation disable
syn-cookies enable
}
interfaces {
ethernet eth0 {
address 192.0.2.2/30
description WAN
duplex auto
speed auto
}
ethernet eth1 {
address 172.23.248.33/27
description LAN
duplex auto
speed auto
}
ethernet eth2 {
disable
duplex auto
speed auto
}
loopback lo {
address 172.23.248.2/32
}
tunnel tun0 {
address 172.23.248.10/31
description "CREST-DN42 AS64828"
encapsulation gre
local-ip 192.0.2.2
mtu 1400
multicast disable
remote-ip 192.0.2.243
ttl 255
}
}
policy {
prefix-list AS64746-IPv4 {
rule 1 {
action permit
le 32
prefix 172.23.248.0/24
}
}
prefix-list DN42-IPv4 {
rule 1 {
action permit
description "DN42 native"
ge 23
le 28
prefix 172.22.0.0/15
}
rule 2 {
action permit
description "DN42 anycast"
ge 32
prefix 172.22.0.0/24
}
rule 3 {
action permit
description Freifunk
ge 16
prefix 10.0.0.0/8
}
rule 4 {
action permit
description ChaosVPN
ge 23
prefix 172.31.0.0/16
}
}
route-map AS64746 {
rule 1 {
action permit
match {
ip {
address {
prefix-list AS64746-IPv4
}
}
}
}
}
route-map DN42 {
rule 1 {
action permit
match {
ip {
address {
prefix-list DN42-IPv4
}
}
}
}
}
}
protocols {
bgp 64746 {
aggregate-address 172.23.248.0/24 {
summary-only
}
neighbor 172.23.248.11 {
description CREST-DN42
peer-group DN42
remote-as 64828
update-source 172.23.248.10
}
network 172.23.248.0/24 {
}
parameters {
router-id 172.23.248.2
}
peer-group DN42 {
route-map {
export DN42
import DN42
}
soft-reconfiguration {
inbound
}
}
redistribute {
connected {
route-map AS64746
}
}
}
static {
route 0.0.0.0/0 {
next-hop 192.0.2.1 {
}
}
route 172.23.248.0/24 {
blackhole {
distance 255
}
}
}
}
service {
nat {
rule 6000 {
outbound-interface eth0
type masquerade
}
}
ssh {
disable-password-authentication
port 22
protocol-version v2
}
ubnt-discover {
disable
}
}
system {
config-management {
commit-revisions 10
}
domain-name ryan.dn42
host-name edge1
login {
banner {
pre-login ""
}
user ryan {
authentication {
encrypted-password :)
public-keys ryan {
key 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
type ssh-rsa
}
}
level admin
}
}
name-server 4.2.2.2
name-server 8.8.8.8
ntp {
server 0.ubnt.pool.ntp.org {
}
server 1.ubnt.pool.ntp.org {
}
server 2.ubnt.pool.ntp.org {
}
server 3.ubnt.pool.ntp.org {
}
}
offload {
ipsec enable
ipv4 {
forwarding enable
}
ipv6 {
forwarding enable
}
}
options {
reboot-on-panic true
}
package {
repository squeeze {
components "main contrib non-free"
distribution squeeze
password ""
url http://http.us.debian.org/debian
username ""
}
repository squeeze-security {
components main
distribution squeeze/updates
password ""
url http://security.debian.org
username ""
}
repository squeeze-updates {
components "main contrib non-free"
distribution squeeze-updates
password ""
url http://http.us.debian.org/debian
username ""
}
}
syslog {
global {
facility all {
level notice
}
facility protocols {
level debug
}
}
}
}
vpn {
ipsec {
auto-firewall-nat-exclude disable
esp-group ESP-AES128-SHA1-DH5-TRANSPORT {
compression disable
lifetime 3600
mode transport
pfs dh-group5
proposal 1 {
encryption aes128
hash sha1
}
}
ike-group IKE-AES128-SHA1-DH5 {
lifetime 28800
proposal 1 {
dh-group 5
encryption aes128
hash sha1
}
}
ipsec-interfaces {
interface eth0
}
site-to-site {
peer 192.0.2.243 {
authentication {
mode rsa
rsa-key-name crest-dn42
}
connection-type initiate
default-esp-group ESP-AES128-SHA1-DH5-TRANSPORT
ike-group IKE-AES128-SHA1-DH5
local-ip 192.0.2.2
tunnel 0 {
allow-nat-networks disable
allow-public-networks disable
esp-group ESP-AES128-SHA1-DH5-TRANSPORT
protocol gre
}
}
}
}
rsa-keys {
rsa-key-name crest-dn42 {
rsa-key 0sAwEAAbsbRoUcgdm4A4Nm+PLxWcW+zFis7pkaJ0MkGVzM7VC8nmngkM+W2zqZyQ4NUTBKKfGOUc4Ogi6gyhlzUnHdag9tDERIX+BwlDO6G4arod9z9KqmJuX4AOYVjH5QlAPz7NDMAezVekGoVLPGdOAMPD6NN54ihLRH6V3if8AGoJRpiajhcgQipjeQnhH4QhsYK4XSjayGT1onQwA8nhy5kt4ofyqSale4Fl4166S9tCn4RKwtlJDjR6VIrg6op6Ip8+ke2vjEHPJHj6qVsxfRgOk2d8pY8oPVt8ayc5F1z+lqJ7R0fADfN+AQSaBqOMmg5dHDFYWwgYkU5egdVKS7Oko6uNuUWsZ0VEnRoPZ4syJEUbiF5wGfaVBaaVLZYUlRLQCffB4JKzp+JesVToCX6JYRfb4JYQWFCDeQfrqRZHM4r13h8MOWPn9cqXcP47RKJjzNp6595biUotmCbMHyy/uveMWxK6vDzPQRkywqMMJE2qOyACmbMnSce9KlYhvma82Vd+z/9/U9NEy0s5MaYNDn+q+KYT5My3NSv52F6sLVGrKxTk79tzUejZcoukJv+gf51Epam4kVHzPIal/khsfjZn6YCU2j5+qcdRmzF+SG5c2WicvEU2Gc4ratfYNEPxU5oArzHIhIz6x2nAF+szcx/x8GEyXPNHnxEboJB7ox
}
}
}
zone-policy {
zone DN42 {
default-action reject
description DN42
from Local {
firewall {
name allow-all-v4
}
}
from LAN {
firewall {
name allow-all-v4
}
}
interface tun0
}
zone LAN {
default-action reject
from DN42 {
firewall {
name DN42-to-LAN
}
}
from Local {
firewall {
name allow-all-v4
}
}
from WAN {
firewall {
name established-only
}
}
interface eth1
}
zone Local {
default-action reject
from DN42 {
firewall {
name DN42-to-Local
}
}
from LAN {
firewall {
name allow-all-v4
}
}
from WAN {
firewall {
name WAN-to-Local
}
}
local-zone
}
zone WAN {
default-action reject
from LAN {
firewall {
name allow-all-v4
}
}
from Local {
firewall {
name allow-all-v4
}
}
interface eth0
}
}