Dan Irwin wrote: >> -----Original Message----- >> From: centos-bounces at centos.org >> [mailto:centos-bounces at centos.org] On Behalf Of Rudi Ahlers >> Sent: Wednesday, 28 April 2010 11:11 PM >> To: CentOS mailing list >> Subject: [CentOS] how to reroute all ADSL traffic via another >> server on theinternet? >> >> Hi all, >> >> Does anyone know, if it's possible to reroute all (i.e. HTTP / FTP / >> DNS / SMTP / POP3 / IMAP / etc) from an ADSL connected machine via >> another server, which is currently hosted with IS and has full >> internet access? >> >> >> i.e. Can I setup another machine, on a different public IP than the >> dynamic ADSL IP as default gw? OR do I need todo something on that >> machine to work as a router for such a setup? >> >> Both servers in this case is CentOS linux, but I'm sure that won't >> make a big difference? >> > > You could use GRE tunnelling, which is supported by Linux and Cisco > among others. > > You could set up a GRE tunnel between your two sites, assign a /30 for > the link, and route most traffic over the GRE interface (Minus the IP > Address of your remote site - it must be routed via your internet > connection). > > This will behave as a point-to-point link between your sites. > > Check out the ip(8) command, in particular the ip tunnel commands. > > But, something like this should be a nice start: > > ip tunnel add Tunnel0 mode GRE remote 1.2.3.4 > > ifconfig Tunnel0 10.10.10.1 netmask 255.255.255.252 > > ip route add 1.2.3.4/32 via 6.7.8.9 That could work approximately the same as a VPN - but you'll probably also have to source-NAT as you route on to internet destinations so the return packets will follow the same path back. -- Les Mikesell lesmikesell at gmail.com