A Nexus 5010 running NX/OS 5.0(2)N2(1) with the following features
no feature telnet
no telnet server enable
no feature http-server
feature tacacs+
cfs eth distribute
feature udld
feature interface-vlan
feature lacp
feature lldp
feature fex
and an active NTP and SNMP-Server v2c and v3 config as well as one VLAN1 interface configured for inband-mgmt:
interface Vlan1
no shutdown
no ip redirects
ip address 10.1.2.3/24
Shows an unexpected unknown open or filtered UDP port in a Portscan:
# nmap -sU -v -P0 10.1.2.3 -p 0-65535
...
Not shown: 65531 closed ports
PORT STATE SERVICE
67/udp open|filtered dhcps
68/udp open|filtered dhcpc
123/udp open|filtered ntp
161/udp open|filtered snmp
11297/udp open|filtered unknown
How can i find out what caused this port to be either open (what service?) or filtered (what ACL/implied filter?)
Juergen
