Problem: Reverse Proxy Should Use a Specific IP(v6) Address on an Multihomed Interface

Christian Felsing <pug@xxxxxxxxxxx> · Wed, 06 Aug 2008 08:46:16 +0200

Hello,

I created a specific configuration for a reverse proxy, which does some 

URL rewriting and accesses a remote server. This rproxy is a IPv6 to 

IPv4 gateway to allow IPv4 users accessing IPv6 only servers. IPv6 

interface has multiple IPv6 addresses:

1.) 2a01:dead:beef::2/128
2.) 2a01:dead:beef:2::2/124
3.) 2a01:dead:beef::f001/128

httpd is configured so it listens on 1) and 3) only, but it uses 3) as 

outgoing IPv6 address.

Is it possible to tell httpd to use 1) instead of 3) as source IP 

address if rproxy accesses an IPv6 host ?

This is my configuration of regarding vhost:

<VirtualHost 193.x.x.x:80>
  ServerName 4.xxx
  ServerAlias *.4.xxx
  DocumentRoot "/home/www/xxx"
  CustomLog /var/log/apache2/xxx/access_log combined
  ErrorLog /var/log/apache2/xxx/error_log

  RewriteEngine on

  RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK)
  RewriteRule .* - [F]

  ProxyVia Block

  RewriteCond   %{HTTP_HOST} ^(.+)\.4\.ip6\.li$
  RewriteMap    ip6-map      prg:/mytools/ip4to6gw.pl
  RewriteRule   ^(.+)        %{HTTP_HOST}$1          [C]
  RewriteRule   ^(.+)        http://${ip6-map:$1}    [P]

</VirtualHost>

Only problem is remote IPv6 server see address 2a01:dead:beef::f001 

instead of 2a01:dead:beef::2 which would be desired source IP address. 

Everything else works as expected.

best regards
Christian Felsing

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