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Full Discussion: selective masquerading
Special Forums IP Networking selective masquerading Post 302304307 by NESter on Monday 6th of April 2009 05:14:59 AM
Old 04-06-2009
UPDATE: I was able to get the selective masquerading to "work"... sort of.

The problem is if I don't have a default route for ppp0 then the 192.168.1.0/24 network can't reach anywhere. I add the default gw for ppp0 and then 192.168.0.0/24 can't reach anywhere.

What I don't understand at all though... if I have both default routes in, the linux server uses eth1 as its default, as evidenced by my source IP when I log in to internet sites. The vpn client machine (192.168.1.13) goes out over the VPN (ppp0) interface as expected. But my other lan clients (192.168.0.2 for example) can't get out to the internet if I try to masq over eth1 (but can f I switch it to masq over ppp0). What gives here? Both routes clearly work since the linux machine gets out over the ISP connection, so why can't it masquerade the ISP connection now, only the VPN?

My problem before was that I had the iptables service (under fedora) running, which seemed to not allow me to delete the original MASQUERADE directive to forward all traffic (regardless of source) via eth1. Now with my tables loaded manually the based-on-source part seems to work, just only with one internet connection (ISP or VPN) as its destination at a time. My hair's falling out here. This makes even less sense than the last situation did.

The masquerade will only work over whichever is the last default route added, even though linux seems to be smart enough to route through eth1 by default for its own local traffic despite the existence of the second "default" route.
Last edited by NESter; 04-06-2009 at 06:19 AM.. Reason: update
 

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LEARN ABOUT CENTOS

wireless

WIRELESS(7)						     Linux Programmer's Manual						       WIRELESS(7)

NAME

       wireless - Wireless Tools and Wireless Extensions

SYNOPSIS

       iwconfig
       iwpriv -a

DESCRIPTION

       The  Wireless  Extensions  is  an API allowing you manipulate Wireless LAN networking interfaces.  It is composed of a variety of tools and
       configuration files. It is documented in more detail in the Linux Wireless LAN Howto.
       The Wireless Tools are used to change the configuration of wireless LAN networking interfaces on the fly, to get their  current	configura-
       tion, to get statistics and diagnose them. They are described in their own man page, see below for references.
       Wireless  configuration	is specific to each Linux distribution. This man page will contain in the future the configuration procedure for a
       few common distributions. For the time being, check the file DISTRIBUTIONS.txt included with the Wireless Tools package.

DEBIAN 3.0
       In Debian 3.0 (and later) you can configure wireless LAN networking devices using the network configuration tool ifupdown(8).

       File : /etc/network/interfaces

       Form : wireless-<function> <value>
	      wireless-essid Home
	      wireless-mode Ad-Hoc

       See also :
	      /etc/network/if-pre-up.d/wireless-tools
	      /usr/share/doc/wireless-tools/README.Debian

SuSE 8.0
       SuSE 8.0 (and later) has integrated wireless configuration in their network scripts.

       Tool : Yast2

       File : /etc/sysconfig/network/wireless
	      /etc/sysconfig/network/ifcfg-*

       Form : WIRELESS_<function>=<value>
	      WIRELESS_ESSID="Home"
	      WIRELESS_MODE=Ad-Hoc

       See also :
	      man ifup
	      info scpm

ORIGINAL PCMCIA SCRIPTS

       If you are using the original configuration scripts from the Pcmcia package, you can use this method.

       File : /etc/pcmcia/wireless.opts

       Form : *,*,*,*)
		  ESSID="Home"
		  MODE="Ad-Hoc"
		  ;;

       See also :
	      /etc/pcmcia/wireless
	      File PCMCIA.txt part of Wireless Tools package

AUTHOR

       Jean Tourrilhes - jt@hpl.hp.com
       http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/

SEE ALSO

       iwconfig(8), iwlist(8), iwspy(8), iwpriv(8), iwevent(8).

wireless-tools							   4 March 2004 						       WIRELESS(7)
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