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How to close port?

Sylvain Brault
Level 1
Level 1

Hello,


I use access list to close port on entry from internet but when I scan the port from internet, the port is still open (for instance 53 or domain). Does someone have any idea?


I have a Cisco 1921 router on iOS 15.3


Here is a part of my configuration :

interface Dialer1

mtu 1492

ip address negotiated

ip access-group RESTRICT_ENTRY_INTERNET in

ip nat outside

ip virtual-reassembly in

encapsulation ppp

dialer pool 1

dialer-group 1

ppp authentication pap callin

ppp chap hostname xxxxxxxxxx

ppp chap password 0 xxxxxxxxxxxxxx

ppp pap sent-username xxxxxx password 0 xxxxxx

!

ip access-list extended RESTRICT_ENTRY_INTERNET

deny   tcp any any eq telnet

deny   tcp any any eq 22

deny   tcp any any eq www

deny   tcp any any eq 443

permit ip any any

deny   tcp any any eq domain

2 Accepted Solutions

Accepted Solutions

cadet alain
VIP Alumni
VIP Alumni