I have the current rules in an attempt to open port 5060 and 10000-20000 for my VoIP provider. We are on a Cisco 1921 router. This ACL is applied to the WAN port on the router facing the ISP. Nmap port scan shows these ports as closed.
- Can anyone help verify my ACL and correct my rule if necessary?
- Do I need an outbound ACL to open up the port as well since this is for a hosted VoIP PBX?
- Is Nmap not detecting the open port because I am not the specific host for the ACL? I tried some other ports that are not specific to a public IP and Nmap also shows as closed.
- Do my L3 switches behind the router also need an ACL to open ports if they are between the PC and the router?
Router Config
interface GigabitEthernet0/0
description WAN
ip address x.x.x.x 255.255.255.240
ip access-group 101 in
ip nat outside
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet0/1
description LAN
ip address 192.168.1.2 255.255.255.0
ip nat inside
ip virtual-reassembly in
duplex auto
speed auto
!
access-list 101 permit udp host x.x.x.x any eq 5060
access-list 101 permit udp host x.x.x.x any range 10000 20000
Nmap Port Scan
Starting Nmap 6.47 ( http://nmap.org ) at 2015-03-04 16:24 PST
Nmap scan report for
Host is up (0.022s latency).
PORT STATE SERVICE
5060/udp closed sip
Starting Nmap 6.47 ( http://nmap.org ) at 2015-03-04 16:24 PST
Nmap scan report for
Host is up (0.023s latency).
PORT STATE SERVICE
10000/udp closed ndmp
Starting Nmap 6.47 ( http://nmap.org ) at 2015-03-04 16:24 PST
Nmap scan report for wsip-184-191-183-54.sd.sd.cox.net (184.191.183.54)
Host is up (0.026s latency).
PORT STATE SERVICE
20000/udp closed unknown