Visit Jeremy's Blog.
Go Back > Forums > Linux Forums > Linux - Security
User Name
Linux - Security This forum is for all security related questions.
Questions, tips, system compromises, firewalls, etc. are all included here.


  Search this Thread
Old 11-23-2001, 03:39 PM   #1
LQ Newbie
Registered: Nov 2001
Posts: 3

Rep: Reputation: 0
linux firewall with internet zone, dmz and trusted zone

i am using redhat 7.0, kernel 2.2.16 and ipchains using 3 nics.

i am setting a linux box as a firewall that connect directly to a cisco 1600 series router and breaks up the network into a dmz and trusted network zone.

i have done the necessary changes in the kernel routing on the firewall that is :

route to subnet is via interface this is done by removing the one for interface
route to the gateway is

the router lan port has a public ip
the firewall internet port has a public ip
the dmz nic has a public ip
the trusted nic has a private ip masquerading all traffic.

my problem here is after setting an ip route on the router stating that the gateway for network is via the dmz zone is not accessible from the internet but the trusted network has no problems accessing to and from the internet and the dmz.

is this scenario a router or linux issue.

i have setup the forwarding rules properly.

can anyone provide any tips to configure a cisco router to function properly here if it is the router issue.
Old 11-27-2001, 04:45 AM   #2
Registered: Apr 2001
Location: London
Posts: 408

Rep: Reputation: 31
It could be either.

Show us the output from

route -n
ifconfig -a

Also how many IP addresses have you got assigned to you to use and has someone setup the router to route to the firewalls external ip address for the whole subnet. ?



Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help Firewall Zone Alarm Pro Avenge19 Linux - Newbie 3 10-17-2004 05:52 AM
Help Firewall Zone Alarm Pro Avenge19 SUSE / openSUSE 1 10-17-2004 04:07 AM
undefined zone dmz and localdomain not found? scammeh^ Linux - Networking 1 11-15-2003 09:47 AM
creating a pseudo-dmz zone bobster666 Linux - Networking 2 02-13-2003 09:49 AM
Linux firewall with internet & dmz & trusted ikhwan98 Linux - Networking 0 11-23-2001 07:59 AM > Forums > Linux Forums > Linux - Security

All times are GMT -5. The time now is 07:16 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration