IPv6 and NAT

[Jim]

I wrote a article describing how to use IPv6 behind a NAT. It is wrote
for BSD, but it should help you at well. You can see it in the latest
issue of Daemon News (http://www.daemonnews.org/) at
http://www.daemonnews.org/200009/ipv6.html.

Good luck.

On Sun, Sep 03, 2000 at 04:25:46PM -0400, Sean Quaint wrote:
> Hello,
> 
> I have a linux box ipchains to hide a couple hosts behind a cable
> modem.  It runs only IPv4.  One of my private hosts is a Solaris 8 sparc
> with IPv6 enabled.  I've run the perl script from freenet6.net, and have
> now the following ip setup:
> 
> # ifconfig -a
> le0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
> inet 192.168.100.11 netmask ffffff00 broadcast 192.168.100.255 ether
> 8:0:20:76:78:69
> le0: flags=2000841<UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2  ether
> 8:0:20:76:78:69 inet6 fe80::a00:20ff:fe76:7869/10
> ip.tun0: flags=2200850<POINTOPOINT,RUNNING,MULTICAST,NONUD,IPv6> mtu
> 1480 index 3   inet tunnel src 24.30.58.147 inet6 fe80::181e:3a93/10 -->
> fe80::ce7b:1f66
> ip.tun0:1: flags=2200850<POINTOPOINT,RUNNING,MULTICAST,NONUD,IPv6> mtu
> 1480 index 3 inet6 3ffe:b00:c18:1fff::65b/128 --> 3ffe:b00:c18:1fff::65a
> 
> ip.tun0:2: flags=2200850<POINTOPOINT,RUNNING,MULTICAST,NONUD,IPv6> mtu
> 1480 index 3 inet6 3ffe:b00:c18:1fff::65b/128 --> 3ffe:b00:c18:1fff::65a
> 
> and my routing tables are:
> 
> # netstat -rn
> 
> Routing Table: IPv4
>   Destination           Gateway           Flags  Ref   Use   Interface
> -------------------- -------------------- ----- ----- ------ ---------
> 192.168.100.0        192.168.100.11        U        1      6  le0
> 224.0.0.0            192.168.100.11        U        1      0  le0
> default              192.168.100.2         UG       1    184
> 127.0.0.1            127.0.0.1             UH       6  28863  lo0
> 
> Routing Table: IPv6
>   Destination/Mask            Gateway                   Flags Ref
> Use   If
> --------------------------- --------------------------- ----- --- ------
> -----
> fe80::/10                   fe80::a00:20ff:fe76:7869    U       1      0
> le0
> ff00::/8                    fe80::a00:20ff:fe76:7869    U       1      0
> le0
> default                     fe80::a00:20ff:fe76:7869    U       1     17
> le0
> default                     3ffe:b00:c18:1fff::65a      UG      1      0
> 
> ::1                         ::1                         UH      1      0
> lo0
> 
> 
> Now when I try to ping an IPv6 addr, I get no route to host:
>  # ping -A inet6 ftp.ring.gr.jp
> ICMPv6 Address Unreachable from gateway fe80::a00:20ff:fe76:7869
>  for icmp6 from fe80::a00:20ff:fe76:7869 to 2001:240:3:2::1
> 
> I'm sure the NAT configuration has something to do with this.  But I'm
> not sure what to do about it.
> 
> Thanks in advance,
> 
> Sean Quaint
> 
> 

-- 
Jim O'Gorman           | Captain Hook died of jock itch.     
UNIX Admin             |                                     
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jameso@elwood.net      |                                     
jameso@class.com       |