I am going through the LARTC howto to understand how the iproute2 works. But some concepts like Policy Routing, RPDB etc are not clear to me. I am pretty new to iproute, beeing using route command for long...
From what I understand
1. rules (ip rule) tell how to select packets for routing and route (ip route) tell where to route the selected packets.
2. A collection of rules is RPDB
3. Policy routing is routing using rules.
4. rules can specify a packet on various parameters, like source dest, fwmark, interface etc...
5. route can tell only dst interface or next hop.
I am sure I am missing some thing. I read and reread the howto and man pages, but it's still some what hazy.
The original requirement with which I started off is this:
I have a lan, with full public IPs, which normally access Internet. I want to route one subnet of that lan via my linux box (for removal of obnoxious content for children) Normally the lan is connected to net via 2 cisco box. I have configured the cisco boxen to send packets to my linux box, from and to. Now I just have to route them properly in my box.
My linux box has 2 ips, 192.168.60.1 and 192.168.50.1, both cisco boxes have corresponding 50.2 and 60.2 address, and I can ping both cisco boxes. cisco boxes has normal public ips also.
The network dig is as follows:
[ client ] [cisco 1 ] [linux ] [cisco 2 ]
[100.100.100.100]<->[100.100.100.101] [192.168.60.1]<->[192.168.60.2]
[192.168.50.2 ]<->[192.168.50.1] [100.100.101.100]<-> [Internet]
I hope my dig is legible. This is what I want to do. I would much appreciate if some one can give a clear picture as to how iproute works.
thanks and regards,
raj
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