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redhat server won't route thru firewall

redhat server won't route thru firewall

Post by Allen Walke » Thu, 08 Mar 2001 10:16:58



Ok here's the deal.. I have a linux box set up as a firewall:

eth0 x.136
eth1 x.137

table:

x.129   *       x.255  eth0
x.136   *       x.255  eth0
x.137   *       x.255  eth1
x.138   *       x.192  eth1  (my subnet)
127.0   *       255.0
default x.129   0.0     eth0

Ok now I have a linux host sitting inside the firewall:

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
x.130           *               255.255.255.255 UH        0 0          0 eth0
x.128            *               255.255.255.192 U         0 0          0 eth0
127.0.0.0       *               255.0.0.0       U         0 0          0 lo
default         207.8.43.137    0.0.0.0         UG        0 0          0 eth0

THIS HOST WON'T WORK. I can pig all IP's on the LAN and it works fine.
Note: this is not
the firewall, b/c win boxes and another vanilla redhat 7.0 system will route
thru the firewall and can ping hosts on the internet. I have the firewall set
up to ACCEPT everything for now. It's just a router to the router pizza box
from our ISP.

The system is a vanilla 6.0 system upgraded to vanilla 6.2. I know this can
work.

BTW if plug this host DIRECTLY into the dumb pizza box router, it works (
assuming I change the default gw from .137 (the firewall) to .129 (the routers
address)

Any help appreciated.

-allen-

 
 
 
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redhat server won't route thru firewall

Post by rand » Fri, 09 Mar 2001 02:46:40


Allen
Try this page for help and feel free to ask any questions after.

http://hotwired.lycos.com/webmonkey/99/30/index3a_page3.html

Randy


> Ok here's the deal.. I have a linux box set up as a firewall:

> eth0 x.136
> eth1 x.137

> table:

> x.129   *       x.255  eth0
> x.136   *       x.255  eth0
> x.137   *       x.255  eth1
> x.138   *       x.192  eth1  (my subnet)
> 127.0   *       255.0
> default x.129   0.0     eth0

> Ok now I have a linux host sitting inside the firewall:

> Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
> x.130           *               255.255.255.255 UH        0 0          0 eth0
> x.128            *               255.255.255.192 U         0 0          0 eth0
> 127.0.0.0       *               255.0.0.0       U         0 0          0 lo
> default         207.8.43.137    0.0.0.0         UG        0 0          0 eth0

> THIS HOST WON'T WORK. I can pig all IP's on the LAN and it works fine.
> Note: this is not
> the firewall, b/c win boxes and another vanilla redhat 7.0 system will route
> thru the firewall and can ping hosts on the internet. I have the firewall set
> up to ACCEPT everything for now. It's just a router to the router pizza box
> from our ISP.

> The system is a vanilla 6.0 system upgraded to vanilla 6.2. I know this can
> work.

> BTW if plug this host DIRECTLY into the dumb pizza box router, it works (
> assuming I change the default gw from .137 (the firewall) to .129 (the routers
> address)

> Any help appreciated.

> -allen-


 
 
 
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1. How to browse internt thru' LAN's MS proxy server (also serving as firewall)

Hi,

Recently, I installed Redhat Linux 7.0 at my office computer.  Our intranet
uses all Microsoft stuff and all my collegues use windows boxes.

I could manage to connect my linux box to interal LAN successfully (also
could browse the network neighbourhood by using Samba server).  We have DHCP
server on our LAN.  So, I have used DHCP client protocal for my Linux box.  
So during login, I could automatically get private IP address, gateway, IP
address of internal DNS server correctly.  These things I confirmed by
checking relevant configuration files (like /etc/resolv.conf ,
/etc/sysconfig/network ...) in my linux box.

But, I can't get authenticated by our firewall ( ofcouse, in netscape, proxy
server options , I have enterned correct address of our internal firewall &
port). Another thing, I observed, if use "connect thru' proxy server option
in netscape, I can't even surf our INTRANET sites.  But if I change, options
to " direct connection to internet" in Netscape, I could surf the INTRANET
sites.

But same thing, If I do using Winnt system, I could successfully get
authenticated thru' our firewall to browse the internet.

We use MS proxy server 2.0.  Another interesting thing I observated is :  
When I use WINNT system & start IE5.5 for internet browsing, during
authentication process, there are 3 feilds displayed

field#1 : username
field#2 : password
field#3 : domainname

But , When I use my Linux box & start Netscape 4.75, during authentication
process, only first two fields are displayed. I don't know why.  Is this
creating problem..

Could anybody help me, why I am not able connect my Linux box to internet
thru MS proxy server.

thanx in advance.

DJ Rao
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