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Full Discussion: Wierd networking issue
Top Forums UNIX for Dummies Questions & Answers Wierd networking issue Post 302142653 by pflink on Monday 29th of October 2007 03:54:40 AM
Old 10-29-2007
Wierd networking issue

I have Debian Etch release as a fresh install on a PIII to be a router/firewall. I've configured networking, and utilized Shorewall to set up iptables scripting. I've installed dhcp3, both client and server, to pull an ip from my broadband cable modem, and dish out ip's to a switch for other systems.

I was having an issue with not having net access beyond the firewall, and was not able to ping back and forth from the firewall to any other system(WinXP SP2 to be particular) on the network. discovered an errant entry in the dhcpd.conf file that listed an incorrect DNS server, and now I have net access on the other systems, however I still cannot ping between the firewall and other systems on the local network.

My questions are why is this working? Without the 2 communicating, seems to me net access is not possible, and anyone have pointers to get things going correctly?
 

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NETSCRIPT-2.2.conf(5)						File Formats Manual					     NETSCRIPT-2.2.conf(5)

NAME
/etc/netscript/network.conf - interface, firewalling, and QoS configuration file. /etc/netscript/if.conf - interface setup shell script file /etc/netscript/qos.conf - QoS setup shell script file /etc/netscript/ipfilter.conf - IP chains filtering shell script file /etc/netscript/srvfilter.conf - server IP filter shell script file DESCRIPTION
This manpage is a place holder until something better is written when the netscript itself has stopped changing rapidly. Please see the README file in the /etc/netscript directory, and READ the configuration files if you need to change them. Apart from net- work.conf, all of them contain sh (1) shell script functions which are there so that various things can be altered or hooked in at the right place. Network.conf contains the full network setup details, including special interface setup for the likes of ciped/pppd/wanconfig, and is fully commented with examples given. UPGRADE PATH FROM KERNEL 2.2.X The firewall/IP filtering stuff in ipfilter.conf is the part that changed radically with the move to iptables and a far better way of set- ting up the IP filtering rules, however the QoS and interface startup/shutdown in if.conf have changed but are backwards compatible with the old 2.2.x ipchains version of netscript for the interface address configuration settings. You will have to set up the filtering again to use iptables by directly using the iptables commands. Also, the kernel 2.2.x version scripts are set up so that iptables is only run on a 2.4.x kernel, otherwise IP forwarding is disabled if beforehand you set IPFWDING_KERNEL to FILTER_ON in network.conf. This means that when you upgrade a box to a 2.4.x router kernel, you should then be able to reboot it and log into remotely and upgrade netscript to the version that will support 2.4.x. In this situation, if you have set old IPFWDING_KERNEL setting to FILTER_ON beforehand in network.conf, all IP forwarding through the box will also be disabled. This means that you can safely remotely upgrade a firewall. SEE ALSO
netscript(8), ipchains(8), iproute(8), brcfg(8). AUTHOR
This manual page was written by Matthew Grant <grantma@anathoth.gen.nz>, for the Debian GNU/Linux system (but may be used by others). BUGS
The author is lazy. He needs to write btter man pages... November 23, 2000 NETSCRIPT-2.2.conf(5)
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