topic ZBF and Url-Filtering ( Web-sense ) in Network Security

ZBF and Url-Filtering ( Web-sense )

communication.boy — Mon, 11 Mar 2019 23:43:40 GMT

I have Zone Based Firewall running on a 2821 router and would like to configure Url Filtering with Websence . IOS running on that device is

c2800nm-adverterprisek9-mz.150-1.M7.bin . Once you have ZBF config you cant configure url-filtering using classic way ( ip inspect ) and this has to be done using class , policy maps .

For this to to happen it is required to have match protocol http command under the class map , it wont work using the match access-group command . Following is what I configured

ip access-list extended NAT

permit ip 172.20.0.0 0.0.255.255 any

class-map type inspect match-all Inside_to_Restrict

match access-group name NAT

match protocol http

Once I put match protocol http command browsing becomes dead slow , also without using match protocol command I cant continue to configure Url Filtering . Is this a problem related to IOS where match protocol command isnt working fine . I have checked CPU utlization of Router and it was roughly near 7 percent .

ZBF and Url-Filtering ( Web-sense )

Julio Carvajal — Fri, 17 Aug 2012 21:50:37 GMT

Hello,

Please use the followin link, if you still have problems then let us know

http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a00808bc994.shtml#url-filter

Re: ZBF and Url-Filtering ( Web-sense )

communication.boy — Fri, 17 Aug 2012 22:56:10 GMT

Following was the configuration done

ip access-list extended NAT
 permit ip 172.20.0.0 0.0.255.255 any
!
!
parameter-map type urlfpolicy websense websense-param-map
 server 172.20.1.6 timeout 30
 truncate script-parameters
 cache-size maximum-entries 100
 cache-entry-lifetime 1
!
!
class-map type inspect match-all Inside_to_Restrict
 match access-group name NAT
 match protocol http
!
policy-map type inspect Inside_to_Restrict
 class type inspect Inside_to_Restrict
  inspect
  service-policy urlfilter websense-policy
 class class-default
  drop
policy-map type inspect urlfilter websense-policy
 parameter type urlfpolicy websense websense-param-map
 class type urlfilter websense websense-class
  server-specified-action
  log
!
!
zone-pair security Inside_to_Restrict source Inside destination Restrict
 service-policy type inspect Inside_to_Restrict

I could see debug messages on which means URL filtering was working but from user end it HTTP was almost dead and website was not opening up .

After doing a lot of troubleshooting I found out that it was a problem related to match protocol http command , when ever I put this command under the class-map HTTP sessions become dead slow . We had communication with someone working with web sense devices and got to know that one more customer had to scrap ZBF for web sense to work .

I cannot apply classic url filtering ( web sense ) which requires ip inspect as router's interfaces are already configured for Zones .

Hi, We have the same problem:

Vivien FRANCOIS — Tue, 30 Sep 2014 14:41:06 GMT

Hi,

We have the same problem: for some websites HTTP response is very slow when using ZBF and Websense urlfilter (6-7 minutes for JPG of ~38Kbytes). If we remove the urlfilter config then the same website loads correctly at good speed.

When using the ip inspect firewall config and urlfilter we had the same problem until we added

access-list 1 permit any

ip inspect name test http java-list 1

With that piece of config on ip inspect the inspect http and URL filter works just fine but there does not seem to be an equivalent for ZBF.

Did you find a solution to use ZBF and not have that issue without rolling back to the IP inspect config ?

Thanks.