Question

How to block internet port 80 on specific network computers - Cisco 871

Asked by: jasonc74

I have a network of about 20+ computers with the need to block port 80 traffic on about 5 of them.  The 5 computers have static IP addresses in the 192.168.0.x subnet.  I have attempted to create an access-list 150 to block 80 on 192.168.0.63 and apply it to Vlan1 but that doesnt seem to work.  I dunno if im not applying the ACL in the right place or not.  

The current router config runs:
   NAT translation for internet access connected to Fe4
   VPN Server with split tunneling for client users
   VPN Point to Point connection to a remote site

Any help would be greatly appreciated!
   

Current configuration : 7143 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname cisco871w
!
boot-start-marker
boot-end-marker
!
logging buffered 51200 warnings
!
aaa new-model
!
!
aaa group server radius rad_eap
!
aaa group server radius rad_mac
!
aaa group server radius rad_acct
!
aaa group server radius rad_admin
!
aaa group server tacacs+ tac_admin
!
aaa group server radius rad_pmip
!
aaa group server radius dummy
!
aaa authentication login eap_methods group rad_eap
aaa authentication login mac_methods local
aaa authentication login sdm_vpn_xauth_ml_1 local
aaa authorization ipmobile default group rad_pmip 
aaa authorization network sdm_vpn_group_ml_1 local 
aaa accounting network acct_methods start-stop group rad_acct
!
aaa session-id common
!
resource policy
!
ip subnet-zero
ip cef
!         
!
no ip domain lookup
ip domain name cpd.local
!
!
crypto pki ..... [cut]
 
  quit
username xxxx privilege 15 secret 5 [cut]
username xxxx secret 5 [cut]
username xxxx secret 5 [cut]
!
! 
!
crypto isakmp policy 1
 encr 3des
 authentication pre-share
 group 2
crypto isakmp key xxxxxxxx address 75.xxx.xxx.xxx
!         
crypto isakmp client configuration group xxxxxxxxx
 key xxxxxxxx
 pool SDM_POOL_1
 acl 103
 max-users 30
crypto isakmp profile sdm-ike-profile-1
   match identity group xxxxxxxx
   client authentication list sdm_vpn_xauth_ml_1
   isakmp authorization list sdm_vpn_group_ml_1
   client configuration address respond
   virtual-template 1
!
!
crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac 
crypto ipsec transform-set ESP-3DES-SHA1 esp-3des esp-sha-hmac 
!
crypto ipsec profile SDM_Profile1
 set transform-set ESP-3DES-SHA 
 set isakmp-profile sdm-ike-profile-1
!
!
crypto map SDM_CMAP_1 1 ipsec-isakmp 
 description Tunnel to75.xxx.xxx.x
 set peer 75.xxx.xxx.xxx
 set transform-set ESP-3DES-SHA1 
 match address 101
!
bridge irb
!
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface FastEthernet4
 description $FW_OUTSIDE$$ES_WAN$
 ip address 75.xxx.xxx.xxx 255.255.255.248
 ip nat outside
 ip virtual-reassembly
 duplex auto
 speed auto
 crypto map SDM_CMAP_1
!
interface Virtual-Template1 type tunnel
 ip unnumbered FastEthernet4
 tunnel mode ipsec ipv4
 tunnel protection ipsec profile SDM_Profile1
!
interface Dot11Radio0
 no ip address
 !
 encryption key 1 size 128bit xxxxxxxxxxxxxxxxxxxxxxx transmit-key
 encryption mode wep mandatory 
 !
 ssid wifi
    authentication open 
    wpa-psk ascii xxxxxxxxxxxxxxxxxxx
 !
 speed basic-1.0 2.0 5.5 6.0 9.0 11.0 12.0 18.0 24.0 36.0 48.0 54.0
 station-role root
 no dot11 extension aironet
 bridge-group 1
 bridge-group 1 subscriber-loop-control
 bridge-group 1 spanning-disabled
 bridge-group 1 block-unknown-source
 no bridge-group 1 source-learning
 no bridge-group 1 unicast-flooding
!
interface Vlan1
 description $ETH-SW-LAUNCH$$INTF-INFO-HWIC 4ESW$
 no ip address
 ip access-group 150 out
 ip virtual-reassembly
 ip tcp adjust-mss 1452
 bridge-group 1
!
interface BVI1
 description $ES_LAN$$FW_INSIDE$
 ip address 192.168.0.10 255.255.255.0
 ip nat inside
 ip virtual-reassembly
!
ip local pool SDM_POOL_1 10.10.50.1 10.10.80.1
ip classless
ip route 0.0.0.0 0.0.0.0 75.xxx.xxx.xxx
!
ip http server
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
ip nat inside source static tcp 192.168.0.4 4000 interface FastEthernet4 4000
ip nat inside source route-map SDM_RMAP_1 interface FastEthernet4 overload
!
access-list 100 remark SDM_ACL Category=2
access-list 100 remark IPSec Rule
access-list 100 deny   ip 192.168.0.0 0.0.0.255 192.168.1.0 0.0.0.255
access-list 100 permit ip 192.168.0.0 0.0.0.255 any
access-list 101 remark SDM_ACL Category=4
access-list 101 remark IPSec Rule
access-list 101 permit ip 192.168.0.0 0.0.0.255 192.168.1.0 0.0.0.255
access-list 103 remark SDM_ACL Category=4
access-list 103 permit ip 192.168.0.0 0.0.0.255 any
access-list 103 remark SDM_ACL Category=4
access-list 150 remark port80block
access-list 150 deny   tcp host 192.168.0.63 any eq www
access-list 150 permit ip any any
no cdp run
route-map SDM_RMAP_1 permit 1
 match ip address 100
!         
radius-server attribute 32 include-in-access-req format %h
radius-server vsa send accounting
!
control-plane
!
bridge 1 protocol ieee
bridge 1 route ip
banner login ^CC
                                  
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Asked On
2009-09-17 at 14:03:18ID24741492
Tags

Cisco 871 internet block

Topics

Network Routers

,

Miscellaneous Networking

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: jtdebeerPosted on 2009-09-17 at 14:06:53ID: 25361090

There is a workaround.
Use GPEDIT.msc on the local machine.

Then specify a fake proxy for IE and lock the Connecitons tab.  (Will not work for other browsers)


Let me know if you require more detail

 

by: rochey2009Posted on 2009-09-17 at 14:11:34ID: 25361139

Use in instead of out when you apply the access-list to the interface

int vlan1
 ip access-group 150 in

 

by: rochey2009Posted on 2009-09-17 at 14:12:59ID: 25361152

sorry my mistake

you need to do it on the BVI1

int bvi1
ip access-group 150 in

 

by: jasonc74Posted on 2009-09-17 at 15:29:17ID: 25361682

I made these changes:
config t

access-list 150 remark port 80 block
access-list 150 deny tcp host 192.168.0.63 any eq www
access-list 150 deny tcp host 192.168.0.64 any eq www
access-list 150 deny tcp host 192.168.0.65 any eq www
access-list 150 deny tcp host 192.168.0.66 any eq www
access-list 150 deny tcp host 192.168.0.97 any eq www
access-list 150 permit ip any any

int BVI1
ip access-group 150 in

running config changes look like:

interface Vlan1
 description $ETH-SW-LAUNCH$$INTF-INFO-HWIC 4ESW$
 no ip address
 ip virtual-reassembly
 ip tcp adjust-mss 1452
 bridge-group 1
!
interface BVI1
 description $ES_LAN$$FW_INSIDE$
 ip address 192.168.0.10 255.255.255.0
 ip access-group 150 in
 ip nat inside
 ip virtual-reassembly
!
access-list 100 remark SDM_ACL Category=2
access-list 100 remark IPSec Rule
access-list 100 deny   ip 192.168.0.0 0.0.0.255 192.168.1.0 0.0.0.255
access-list 100 permit ip 192.168.0.0 0.0.0.255 any
access-list 101 remark SDM_ACL Category=4
access-list 101 remark IPSec Rule
access-list 101 permit ip 192.168.0.0 0.0.0.255 192.168.1.0 0.0.0.255
access-list 103 remark SDM_ACL Category=4
access-list 103 permit ip 192.168.0.0 0.0.0.255 any
access-list 103 remark SDM_ACL Category=4
access-list 150 remark port 80 block
access-list 150 deny   tcp host 192.168.0.63 any eq www
access-list 150 deny   tcp host 192.168.0.64 any eq www
access-list 150 deny   tcp host 192.168.0.65 any eq www
access-list 150 deny   tcp host 192.168.0.66 any eq www
access-list 150 deny   tcp host 192.168.0.97 any eq www
access-list 150 permit ip any any
no cdp run
route-map SDM_RMAP_1 permit 1
 match ip address 100
!

WORK PERFECT!  Thanks for the quick response!

 

by: jasonc74Posted on 2009-09-17 at 15:31:27ID: 31630286

Worked perfect the first try rochey2009! Thanks

 

by: rochey2009Posted on 2009-09-17 at 15:33:02ID: 25361712

Your welcome,

Regards,
Paul.

20120131-EE-VQP-002

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