Cisco 831 block WAN ping

Hi,

There are a couple of ways of doing this but it depends on the ios feature set that your using. If you have a firewall feature set you could use zone based firewall or CBAC (ip inspect). Otherwise you could set an access-list on the WAN interface.

hi

add the following ACL

access-list 111 deny icmp any any administratively-prohibited
access-list 111 deny icmp any any echo
access-list 111 deny icmp any any echo-reply
access-list 111 deny icmp any any packet-too-big
access-list 111 deny icmp any any time-exceeded
access-list 111 deny icmp any any traceroute
access-list 111 deny icmp any any unreachable
access-list 111 permit   ip any any


interface Ethernet1
ip access-group 111 in

I tried setting an access-list on the WAN interface from an EE example I saw, but then it didn't let anything in or out of the Cisco.  I tried adding the following to my above config:

access-list 101 deny icmp any any
interface e1
ip access-group 101 in

try the one i sent ...
you missed the permit ip any nay at the end

memo tnt, I posted at the same time so I didn't see yours 2 back.  So I just tried it and it does work, the only problem is that I can't ping from inside > out.  I would like to allow all clients to ping out to the internet if necessary.  How is this done?

plz post your current configuration ..

version 12.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
ip inspect name outside icmp
ip ips po max-events 100
no ftp-server write-enable
!
interface Ethernet0
 ip address 192.168.1.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
interface Ethernet1
 ip address 173.160.167.10 255.255.255.248
 ip access-group 111 in
 ip nat outside
 ip virtual-reassembly
 duplex auto
!
interface FastEthernet1
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet2
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet3
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet4
 no ip address
 duplex auto
 speed auto
!
ip classless
ip route 0.0.0.0 0.0.0.0 173.160.167.14
!
no ip http server
no ip http secure-server
ip nat inside source list NAT-Permitted interface Ethernet1 overload
ip nat inside source static tcp 192.168.1.4 3389 173.160.167.10 3389 extendable
!
!
ip access-list extended NAT-Permitted
 permit ip 192.168.1.0 0.0.0.255 any
 deny   icmp any any
 deny   ip any any
access-list 111 deny   icmp any any administratively-prohibited
access-list 111 deny   icmp any any echo
access-list 111 deny   icmp any any echo-reply
access-list 111 deny   icmp any any unreachable
access-list 111 deny   icmp any any packet-too-big
access-list 111 deny   icmp any any time-exceeded
access-list 111 deny   icmp any any traceroute
access-list 111 permit ip any any
!
control-plane
!
!
line con 0
 no modem enable
line aux 0
line vty 0 4
 password *********
 login
 transport input none
!
scheduler max-task-time 5000
end

remove the following from ip access-list extended NAT-Permitted
as:


no ip access-list extended NAT-Permitted

then
ip access-list extended NAT-Permitted
 permit ip 192.168.1.0 0.0.0.255 any

it will solve the issue

I took it out and added it back, but still same issue.  Windows XP client gets 'Request timed out' when pinging 4.2.2.2.  

Hi B1izzard

is it solved here ??

Yes, that worked.  I have no idea why, but I will have to read up on this.  Thanks!