lartc.org FAQ: Multiple internet providers

lartc.org : Linux Advanced Routing & Traffic Control

	lartc.org FAQ : Multiple internet providers
	http://linux-ip.net/html/adv-multi-internet.html If you want load balancing (Nano-HOWTO) : http://www.ssi.bg/~ja/ stef.coene@docum.org
	There are two issues requiring different handling when dealing with multiple Internet providers on a given network. The below assumes that the host which has multiple Internet connections is a masquerading (or NATting) host and is at the chokepoint between the internal and external networks. For the use of multiple inbound connections to the same internal server (public IP A from ISP A and public IP B from ISP B both get redirected to the same internal server), the ideal solution involves using two private IP addresses on the internal server. This leads to an end-to-end uniqueness of public IP to private IP and can be easily accomplished by following the directions here: http://linux-ip.net/html/adv-multi-internet.html#adv-multi-internet-inbound For the use of multiple outbound links to the Internet, there are a number of different techniques. The simplest is identified here: http://linux-ip.net/html/adv-multi-internet.html#adv-multi-internet-outbound Better (and more robust) techniques are available after a kernel routing patch by Julian Anastasov. See the famous nano-howto. http://www.ssi.bg/~ja/ -Martin mabrown-lartc@securepipe.com
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