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UNIX Traceroute thru' Firewall

UNIX Traceroute thru' Firewall

Post by HotSteppa' » Wed, 29 Apr 1998 04:00:00



Hi there...
        I'm facing what I think is a common problem. Our campus network
here is firewalled, and hence when I try a traceroute to any external
host, I only get the "*" for all hops after our default gateway router.
I was wondering if there is any way for me to slip thru' the firewall and
get my traceroute stats (any ports etc)??? I would appreciate any
suggestions. TIA....

!Jay :->

On The Web: http://www.post1.com/~jayanth
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UNIX Traceroute thru' Firewall

Post by Barry Margoli » Fri, 01 May 1998 04:00:00




>Hi there...
>    I'm facing what I think is a common problem. Our campus network
>here is firewalled, and hence when I try a traceroute to any external
>host, I only get the "*" for all hops after our default gateway router.
>I was wondering if there is any way for me to slip thru' the firewall and
>get my traceroute stats (any ports etc)??? I would appreciate any
>suggestions. TIA....

There are many types of firewalls.  Without knowing what your campus is
using, it's impossible to answer this.

However, many firewalls are extremely good at blocking the types of packets
that traceroute depends on.

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*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.

 
 
 
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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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