Linux behind a cisco router

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01-30-2008

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Linux behind a cisco router

Dear All,

I have worked with xDSL routers working in bridged mode, and linux behind them working as a Firewall utilizing IPTABLES. My question is, how this will change if the xDSL router is replaced with a Cisco Router?
I mean to ask that, can I assign a public ip on the linux machine, which is behind the Cisco router? Do I have to do natting/port forwarding on the Router ? One ethernet on router is directly connected to linux machine. Can I utilize some packet analyzer or sniffer to find out what goes on during this type of communication?

Thanks for taking your time to read this.
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( )
( Internet )
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|________ > (Cisco router)___________> (Linux box)

Last edited by tmm; 01-30-2008 at 04:51 AM..

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LEARN ABOUT OPENSOLARIS

defaultrouter

defaultrouter(4)						   File Formats 						  defaultrouter(4)

NAME

       defaultrouter - configuration file for default router(s)

SYNOPSIS

       /etc/defaultrouter

DESCRIPTION

       The /etc/defaultrouter file specifies a IPv4 host's default router(s).

       The format of the file is as follows:

	 IP_address
	 ...

       The  /etc/defaultrouter	file can contain the IP addresses or hostnames of one or more default routers, with each entry on its own line. If
       you use hostnames, each hostname must also be listed in the local /etc/hosts file, because no name services are running at  the	time  that
       defaultrouter is read.

       Lines beginning with the ``#'' character are treated as comments.

       The  default  routes  listed  in this file replace those added by the kernel during diskless booting. An empty /etc/defaultrouter file will
       cause the default route added by the kernel to be deleted.

       Use of a default route, whether received from a DHCP server or from /etc/defaultrouter, prevents a machine from acting as an  IPv4  router.
       You can use routeadm(1M) to override this behavior.

FILES

       /etc/defaultrouter    Configuration file containing the hostnames or IP addresses of one or more default routers.

SEE ALSO

       in.rdisc(1M), in.routed(1M), routeadm(1M), hosts(4)

SunOS 5.11							    17 Aug 2004 						  defaultrouter(4)

IP Networking