Cannot UDP Bind to port 61000 or greater

Cannot UDP Bind to port 61000 or greater

Post by Thomas J. Felle » Sat, 27 Feb 1999 04:00:00



Under Red Hat Linux 5.2 I cannot bind a udp socket to port 61000 or
greater.
Does anyone know why?

--
Thomas J. Feller
Development Manager
Enforcer Technology, Inc.
6767 W. Greenfield Ave
West Allis, WI  53214
414 607-7300
414 607-7304 (fax)

 
 
 

Cannot UDP Bind to port 61000 or greater

Post by Thomas J. Felle » Sat, 27 Feb 1999 04:00:00


I'll answer my own question.

Linix has something called IP masquerading that uses port 61000 through
65096.
These numbers are defined in: /usr/src/linux/include/net/ip_masq.h
More information available at:
http://ipmasq.cjb.net/
http://www.infoworld.com/cgi-bin/displayNew.pl?/petrel/980406np.htm

Now my next question is what is the easiest way to disable this.
I already know I can hack at the source and recompile/link the kernel.


> Under Red Hat Linux 5.2 I cannot bind a udp socket to port 61000 or
> greater.
> Does anyone know why?

--
Thomas J. Feller
Development Manager
Enforcer Technology, Inc.
6767 W. Greenfield Ave
West Allis, WI  53214
414 607-7300
414 607-7304 (fax)

 
 
 

Cannot UDP Bind to port 61000 or greater

Post by Malwar » Sun, 28 Feb 1999 04:00:00


Hi Thomas,


> Under Red Hat Linux 5.2 I cannot bind a udp socket to port 61000 or
> greater.

The ports 61000-65095 are used for the masquerading.

Malware