// post · 589

IPv6 tunnel through IPv4 with a Netscreen

author: Michael Dale ·

I finally got an IPv6 tunnel going on my Netscreen SSG 5. So I thought I'd post the relevant configuration details here.


I'm currently running ScreenOS 5.4.0r3a0; there seems to be some WebUI bugs with IPv6 so it is best to do it via the command line.


Update: I just got a response back from JTAC. IPv6 is only supported on the ISG2000. So I'm unsure when/if it the WebUI bugs will be fixed.


Update2: IPv6 is now supported on the SSG 5 under screenos 6, the WEBUI bug has been fixed.


Background info:
  • Trust interface 10.0.0.254/22 - bgroup0

  • Untrust interface - bgroup2

  • IPv6 broker (broker.aarnet.net.au) - 202.158.196.131

  • IPv6 subnet - 2001:388:c021::1/64


The first step is to enable IPv6 on your Netscreen.


Type the following then save your config and restart the device:

set envar ipv6=yes



Now let's setup the trust interface:

set interface "bgroup0" ipv6 mode "router"

set interface "bgroup0" ipv6 ip 2001:388:c021::1/64

set interface "bgroup0" ipv6 enable

unset interface bgroup0 ipv6 ra link-address

set interface bgroup0 ipv6 ra transmit

set interface bgroup0 ipv6 nd nud



So we've setup my trust interface with the IPv6 subnet and autoconfiguration should be working.


Now let's setup a tunnel interface for the traffic to run through:

set interface "tunnel.1" zone "Untrust"

set interface tunnel.1 ip unnumbered interface bgroup2

set interface "tunnel.1" ipv6 mode "host"

set interface "tunnel.1" ipv6 enable

set interface tunnel.1 tunnel encap ip6in4 manual

set interface tunnel.1 tunnel local-if bgroup2 dst-ip 202.158.196.131



Now we'll setup a static route for IPv6 traffic to go through:

set route ::/0 interface tunnel.1 gateway :: preference 20



And finally we need to setup a policy to allow traffic out:

set policy id 77 from "Trust" to "Untrust" "Any-IPv6" "Any-IPv6" "ANY" permit log

set policy id 77



You may want to setup some policies to allow traffic in too.


That should be all you need to do.

// comments

· saeed guest
Is 4in6 tunneling support avalible in screenos 6.2 on SSG 520 firewall?
#1 Comment Link

// leave a comment

> click for comments help

HTML allowed: <a href="" title="" rel=""></a> <b></b> <blockquote cite=""></blockquote> <em></em> <i></i> <strike></strike> <strong></strong> <li></li> <ol></ol> <ul></ul>
ie: <b>bold</b>

Your comment may need to be reviewed before it is published.