10-14-2005 06:29 PM - edited 03-03-2019 12:26 AM
i would like to implement a guest vlan that would have access to the internet only. this guest vlan will not have visibility to my internal network other
than getting its ip from my DHCP server. i also configured this segment in my dhcp server to point to an external dns. The problem that i am
currently having is i am able to ping my dhcp address and able to telnet to my switches.
please advise
here is my access list configuration below:
interface Vlan790
description Guest Vlan
ip address 192.168.190.1 255.255.255.0
ip access-group 101 in
ip helper-address 192.168.0.13
no ip mroute-cache
!
access-list 101 permit ip any host 192.168.0.13 (my dhcp server)
access-list 101 deny ip 192.168.190.0 0.0.0.255 192.0.0.0 0.255.255.255
access-list 101 deny icmp any any echo
access-list 101 permit ip any any
10-14-2005 10:14 PM
Hi :
Do you have a Hybrid Cat6k with CatOS on switch side and IOS on the MSFC side ? Please check to make sure the ports are set for vlan-based acls instead of port-based acls. That is the most common issue with this platform . You define an ACL on a vlan and since the port is in port-based acl state , the acl on a vlan does not work. Unfortunately , you have not given any details about the platform , that is why I am taking a guess here based on what I have seen in the past.
set port security-acl
Thanks
Salman Z.
10-15-2005 06:47 AM
i am running this on an IOS 4506 with SupIV.
10-17-2005 09:38 AM
I would change the access list to allow only dhcp packets to hit the dhcp server then allow port 53 (dns) to hit whatever dns server you want the guest pc's to access and then add access to allow all port 80/443 traffic outbound. Then by default there is a deny ip any any that will block all other traffic after that.
The reason they can ping your dhcp server is because you have permit ip any any statement. Then the line 'access-list 101 permit ip any any' basically makes your access-list useless because you are allowing all ip traffic throughout your network.
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