How do I disable pinger in Squid?



  • I've been trying to resolve an issue for some time now with squid and have been having a heck of a time with it. We are trying to access a web site that blocks the entire ip if it see's any type of icmp traffic. It looks like the squid package in pfSense was compiled with the RTT feature enabled and I'm not sure how to disable it.

    Here is what I've found, maybe someone knows how to get to the next step?

    Pinger Process:
    Squid ping program is an external program that provides Squid with icmp RTT information so that, it can more effectively choose between multiple remote parent caches for request fulfillment. There are special cases when this option is required, and your Squid must have been compiled with the –enable-icmp configure option for it to work. This option should only be used on caches with multiple parent caches on different networks that it must choose between. The default program to use for this task is called pinger. This option configures the pinger_program directive.
    7.6 Using ICMP to Measure the Network
    As of version 1.1.9, Squid is able to utilize ICMP Round-Trip-Time (RTT) measurements to select the optimal location to forward a cache miss. Previously, cache misses would be forwarded to the parent cache which returned the first ICP reply message. These were logged with FIRST_PARENT_MISS in the access.log file. Now we can select the parent which is closest (RTT-wise) to the origin server.
    Supporting ICMP in your Squid cache
    It is more important that your parent caches enable the ICMP features. If you are acting as a parent, then you may want to enable ICMP on your cache. Also, if your cache makes RTT measurements, it will fetch objects directly if your cache is closer than any of the parents.

    If you want your Squid cache to measure RTT's to origin servers, Squid must be compiled with the USE_ICMP option. This is easily accomplished by uncommenting "-DUSE_ICMP=1" in src/Makefile and/or src/Makefile.in.

    An external program called pinger is responsible for sending and receiving ICMP packets. It must run with root privileges. After Squid has been compiled, the pinger program must be installed separately. A special Makefile target will install pinger with appropriate permissions.
            % make install
            % su
            # make install-pinger
    There are three configuration file options for tuning the measurement database on your cache. netdb_low and netdb_high specify high and low water marks for keeping the database to a certain size (e.g. just like with the IP cache). The netdb_ttl option specifies the minimum rate for pinging a site. If netdb_ttl is set to 300 seconds (5 minutes) then an ICMP packet will not be sent to the same site more than once every five minutes. Note that a site is only pinged when an HTTP request for the site is received.
    Another option, minimum_direct_hops can be used to try finding servers which are close to your cache. If the measured hop count to the origin server is less than or equal to minimum_direct_hops, the request will be forwarded directly to the origin server.



  • I think this is the same thing: http://forum.pfsense.org/index.php/topic,9737.0.html

    still no answer I think.


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