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Example configs


Tunnel interface on Debian

auto marla-ipv6-spn
iface marla-ipv6-spn inet6 v4tunnel
	mode ipip
	ttl 225
	address 2001:67c:21bc:7fff:0001:2:0:2
	netmask 120
	gateway 2001:67c:21bc:7fff:0001:2:0:1

Tunnel interface on OpenWRT

Install the 6in4 package, and add something like this to /etc/config/network (change the addresses):

config interface 'crock6'
	option proto '6in4'
	option peeraddr ''
	option ip6addr '2001:67c:21bc:7fff:0001:10:0:2/64'
	option ip6gw '2001:67c:21bc:7fff:0001:10:0:1'
	option ip6prefix '2001:67c:21bc:c::/64'
	option ttl '255'


In this example, 2001:67c:21bc:7fff:2:1:0:1 and 2001:67c:21bc:7fff:2:1:1:1 are the remote end-points of the tunnels, 2001:67c:21bc:4::/62 is the assigned network, and 65535 is the ASN delegated to this peer.

Basically, this configuration says "connect to the two peers, and filter what I announce to them to be just my own network".

(this is actually the live configuration of initLab)


router bgp 65535
 bgp router-id
 no bgp default ipv4-unicast
 neighbor 2001:67c:21bc:7fff:2:1:0:1 remote-as 200533
 neighbor 2001:67c:21bc:7fff:2:1:0:1 interface lab-ipv6-od
 neighbor 2001:67c:21bc:7fff:2:1:0:1 timers 3 10
 neighbor 2001:67c:21bc:7fff:2:1:1:1 remote-as 200533
 neighbor 2001:67c:21bc:7fff:2:1:1:1 interface lab-ipv6-tbc
 neighbor 2001:67c:21bc:7fff:2:1:1:1 timers 3 10
 address-family ipv6
 network 2001:67c:21bc:4::/62
 neighbor 2001:67c:21bc:7fff:2:1:0:1 activate
 neighbor 2001:67c:21bc:7fff:2:1:0:1 route-map external-out out
 neighbor 2001:67c:21bc:7fff:2:1:1:1 activate
 neighbor 2001:67c:21bc:7fff:2:1:1:1 route-map external-out out
ipv6 prefix-list mine seq 5 permit 2001:67c:21bc:4::/62
ipv6 prefix-list mine seq 15 deny any
route-map external-out permit 10
 match ipv6 address prefix-list mine
route-map external-out deny 20


This is /etc/bird/bird6.conf:

# Configure logging
log syslog { debug, trace, info, remote, warning, error, auth, fatal, bug };

# Listen only on IPv6
listen bgp v6only;

# Write your router id here, any ipv4 address that you have will do
router id;

# The direct protocol automatically generates device routes to
# all network interfaces. Can exist in as many instances as you wish
# if you want to populate multiple routing tables with device routes.
protocol direct {
	interface "*";

# This pseudo-protocol performs synchronization between BIRD's routing
# tables and the kernel. If your kernel supports multiple routing tables
# (as Linux 2.2.x does), you can run multiple instances of the kernel
# protocol and synchronize different kernel tables with different BIRD tables.
protocol kernel {
	export all;

	# Usually, only best routes are exported to the kernel protocol. With
	# path merging enabled, both best routes and equivalent non-best routes
	# are merged during export to generate one ECMP (equal-cost multipath)
	# route for each network. This is useful e.g. for BGP multipath. Note
	# that best routes are still pivotal for route export (responsible for
	# most properties of resulting ECMP routes), while exported non-best
	# routes are responsible just for additional multipath next hops. This
	# option also allows to specify a limit on maximal number of nexthops in
	# one route. By default, multipath merging is disabled. If enabled,
	# default value of the limit is 16. bird 1.6.2+ required.
	#merge paths;

# This pseudo-protocol watches all interface up/down events.
protocol device {
	# Time in seconds between two scans of the network interface list. On
	# systems where we are notified about interface status changes
	# asynchronously (such as newer versions of Linux), we need to scan the
	# list only in order to avoid confusion by lost notification messages,
	# so the default time is set to a large value.
	#scan time 10;           # Scan interfaces every 10 seconds

protocol static {
	route 2001:67c:21bc:4::/64 unreachable; # Sink route

filter ext_originate_ip6 {
	if (net = 2001:67c:21bc:4::/64 ) then accept;
	else reject;

template bgp t_ext_ip6 {
	# replace ASN here!
	local as 65532;
	export filter ext_originate_ip6;


# IPv6 bgp link to marla
protocol bgp marla_tbc_ip6 from t_ext_ip6 {
	description "uplink to marla/tbc over ipv6";
	neighbor 2001:67c:21bc:7fff:1:9:0:1 as 200533;
	# preference 110;        # Set higher preference for Marla

# IPv6 bgp link to tyler
protocol bgp tyler_tbc_ip6 from t_ext_ip6 {
	description "uplink to tyler/tbc over ipv6";
	neighbor 2001:67c:21bc:7fff:2:9:0:1 as 200533;


TODO: explain config

/interface 6to4
add comment="initlab ipv6" local-address= mtu=1480 name=\
    marla-ipv6-bsc remote-address=
add comment="initlab ipv6" local-address= mtu=1480 name=\
    tyler-ipv6-bst remote-address=
/routing bgp instance
set default as=65531
/ipv6 address
add address=2001:67c:21bc:7fff:1:4:0:2/120 advertise=no comment=uplink-marla \
add address=2001:67c:21bc:2:4e5e:cff:feb5:3e93 comment="lan" eui-64=\
    yes interface=bridge-lan
add address=2001:67c:21bc:7fff:2:4:1:2/120 advertise=no comment=uplink-tyler \
/routing bgp network
add network=2001:67c:21bc:2::/64 synchronize=no
/routing bgp peer
add address-families=ipv6 name=tyler remote-address=\
    2001:67c:21bc:7fff:2:4:1:1 remote-as=200533 ttl=default
add address-families=ipv6 name=marla remote-address=\
    2001:67c:21bc:7fff:1:4:0:1 remote-as=200533 ttl=default


Juniper SRX

  • XX.XX.XX.XX is your local ip address

interfaces {
   ip-0/0/0 {
        unit 0 {
            tunnel {
                source XX.XX.XX.XX;
                ttl 255;
            family inet6 {
                address 2001:67c:21bc:7fff:0001:12:1:2/120;
        unit 1 {
            tunnel {
                source XX.XX.XX.XX;
                ttl 255;
            family inet6 {
                address 2001:67c:21bc:7fff:0002:12:0:2/120;
routing-options {
    rib inet6.0 {
        static {
            route 2001:67c:21bc:e::/64 {
                as-path {
                    origin igp;
    router-id XX.XX.XX.XX;
    autonomous-system 65529;
protocols {
    bgp {
        group IPv6-BG-Tunnels {
            type external;
            import import-IPv6-ludost-net;
            family inet6 {
            export export-IPv6-ludost-net;
            neighbor 2001:67c:21bc:7fff:0001:12:1:1 {
                local-address 2001:67c:21bc:7fff:0001:12:1:2;
                peer-as 200533;
                local-as 65529;
            neighbor 2001:67c:21bc:7fff:0002:12:0:1 {
                local-address 2001:67c:21bc:7fff:0002:12:0:2;
                peer-as 200533;
                local-as 65529;
policy-options {
    policy-statement export-IPv6-ludost-net {
        term 0 {
            from {
                route-filter 2001:67c:21bc:e::/64 exact;
            then accept;
        term default {
            then reject;
    policy-statement import-IPv6-ludost-net {
        term default {
            then accept;
security {
    forwarding-options {
        family {
            inet6 {
                mode packet-based;