>-----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 Cheers, Dan