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Network Security Firewalls
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Cisco 2600 Ports Responding...

Subject: Cisco 2600 Ports Responding...
Date: Wed, 8 Sep 2004 13:02:56 -0700 (PDT)
I have done the following nmap UDP scan of two of our Cisco routers 
that terminate our IPSec traffic.  I am wondering if anyone can tell me 
why the ports with asterisks are responding:
 
Starting nmap 3.55 ( http://www.insecure.org/nmap/ ) at 2004-09-08 
10:42 EDT
Interesting ports on x.x.x.x:
(The 1472 ports scanned but not shown below are in state: closed)
PORT    STATE SERVICE
53/udp  open  domain *
67/udp  open  dhcpserver *
123/udp open  ntp
161/udp open  snmp
162/udp open  snmptrap
177/udp open  xdmcp *
 
I am currently working to disable SNMP access from our WAN facing 
interfaces and after doing some initial discovery notcied these ports open 
as well.  I am not running a DHCP server on either of these routers 
(nmap scans are identical).  I am also not sure why XDMCP would be open at 
all on a router.  Is this an error on nmaps part or are these ports 
actually open?
 
Any help would be appreciated.
 
Thanks,
 
Mike.



                
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