03-25-2007 08:07 PM - edited 02-20-2020 09:38 PM
Can anyone tell me what I'm missing here? Trying to set up an ACL that will prohibit any LAN activity while allowing the users to do anything they want outside on the internet if they are accessing the wireless access point.
Here's what I have right now. Internal network is 192.168.1.0 and the gateway/router/etc is at address 192.168.1.254.
Good things about it is, I can't get to anything internal. Also I can get to anything external as long as I know the IP address... so really the only thing I'm missing is DNS resolution. I've tried a few things and nothing seems to work! Any ideas??
Building configuration...
Current configuration : 1802 bytes
!
version 12.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname ap
!
enable secret 5 ....
!
led display alternate
ip subnet-zero
!
!
no aaa new-model
!
dot11 ssid PMIWifi
authentication open
guest-mode
!
power inline negotiation prestandard source
!
!
username ....
!
bridge irb
!
!
interface Dot11Radio0
no ip address
ip access-group wifi in
no ip route-cache
!
ssid PMIWifi
!
speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0
54.0
station-role root
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 block-unknown-source
no bridge-group 1 source-learning
no bridge-group 1 unicast-flooding
bridge-group 1 spanning-disabled
!
interface Dot11Radio1
no ip address
ip access-group wifi in
no ip route-cache
!
ssid PMIWifi
!
dfs band 3 block
speed basic-6.0 9.0 basic-12.0 18.0 basic-24.0 36.0 48.0 54.0
channel dfs
station-role root
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 block-unknown-source
no bridge-group 1 source-learning
no bridge-group 1 unicast-flooding
bridge-group 1 spanning-disabled
!
interface FastEthernet0
no ip address
no ip route-cache
duplex auto
speed auto
bridge-group 1
no bridge-group 1 source-learning
bridge-group 1 spanning-disabled
hold-queue 160 in
!
interface BVI1
ip address dhcp client-id FastEthernet0
no ip route-cache
!
ip http server
no ip http secure-server
ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag
!
ip access-list extended wifi
deny ip any 192.168.1.0 0.0.0.255
permit ip any any
!
control-plane
!
bridge 1 route ip
!
!
!
line con 0
line vty 0 4
login local
!
end
03-26-2007 06:03 AM
Is the dns server on 192.168.1.0? This would explain why you couldnt access it. Try an external dns, do you have the same problems?
03-26-2007 03:44 PM
No it is 192.168.1.254 also. I did try a few things in addition to the config I posted but none of them worked.. rather then posting the wrong thing I wanted to see if anyone could tell me the right thing! ;)
The things I had tried...
permit ip host 192.168.1.254 any
permit ip any host 192.168.1.254
permit udp any any eq 53
permit tcp any any eq 53
Still none of these worked...
03-29-2007 05:27 AM
Is it because I'm doing a deny then an allow?
For instance if you had
deny ip any 192.168.1.254 0.0.0.0
permit ip any 192.168.1.254 0.0.0.0
What would happen? Would the deny override the permit, or vice-versa ? I thought by default in an access list there was a "deny ip any any" unless you specified something else, so to me it sounds like a permit is overriding the deny in that case. What about this one?
03-29-2007 06:25 AM
In your first post you have...
deny ip any 192.168.1.0 0.0.0.255
permit ip any any
If your dns server is 192.168.1.254 this will obviously be denied. That's what I was trying to say before. How about this..this should permit dns to dns server, deny anything else to 192.168.1.0, and permit anything else.
permit udp any 192.168.1.254 0.0.0.0 eq 53
deny ip any 192.168.1.0 0.0.0.255
permit ip any any
03-29-2007 06:34 AM
Yes, in that case the permit line would never be matched as it would start from the top down and all traffic to 192.168.1.0 would match the first line and be denied. There is an implicit deny ip any any at the end of the acl.
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