20 Aug 09 Linux NAT Masquerading HOWTO

Here’s a really quick rundown on setting up masquerading. You’d use this to share one internet connection between multiple local network machines. It’s what most regular ‘routers’ that your ISP sends out do and it’s really easy to set up under Linux in it’s most simplest form
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Tags: iptables, ip_forward, Linux, masquerade, masquerading, modprobe, nat, postrouting

14 Sep 08 Extending tc and iproute2. Linux routing split access multiple uplinks multiple isps iptables masquerading

It’s been a while since I last posted here, so I thought I’d post a followup article to http://www.adamsinfo.com/bandwith-limiting-with-linux-tc-and-iproute2/ which focused on bandwidth limiting in a datacenter environment using tc and iproute2.

I’ve taken the same script but tweaked IPs and bandwith values into my office. Previously I was on a 24mbit down 2.5mbit up DSL connection courtesy of www.bethere.co.uk The office is only about 800m from the closest exchange which is quite nice – I generally find I get 18+mbit down and 1.5+mbit up. Not only great bandwidth, but latency is also very small and responsiveness is great, especially as a regular [constant] SSH use. Recently, despite having no business justification whatsoever, I ordered the same again for the same office. This one clocks in at about 19mbit up and 1.7mbit down – even better! Some ISPs support line bonding – I dont believe that many in the UK do, and seeing as at the time of writing, bethere were the only ISP to support anywhere close to 24mbit, I wasn’t going to try and find another.
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Tags: Extending tc and iproute2, faster torrent, iproute2, iptables, Linux routing, masquerading, multiple isps, multiple uplinks, Routerboard load balancing, split access, tc, torrent