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How to filter and block traffic based on geographic location?

11/22/2021 29 People found this article helpful 85,277 Views

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    Description

    Geo-IP Filter allows administrators to block connections coming to or from a geographic location to resolving the public IP address to a particular country. By default firewall makes a TCP-3 way handshake for any blocked country and after it displays the block banner to the end user.

    However, few administrator may need to skip this event and straight away block the outbound connection to the blocked country IPs by blocking the first SYN packet in the TCP connection  where user will not get any information of block message.

    Resolution

    Firewall will show the banner of geo ip blocking in default configurations. The user trying to access any blocked content will get below message on his end device and firewall capture done based on source IP will show the below behavior :

     Image


    Image



    In order to do the intense scanning by block the initial TCP handshake  , please perform the below steps :


    RESOLUTION FOR SONICOS 7.X

    1. Navigate to internal settings page of the Sonicwall firewall by putting the syntax on browser https://<Mgmt-ip>/sonicui/7/m/Mgmt/settings/diag

    2.  Navigate to GeoIP/Location service

    3. Uncheck the option 'Show block page for geoip and botnet filtering'

    4. Click Accept at the top.

    Image



    RESOLUTION FOR SONICOS 6.5

    1. Navigate to internal settings page of the Sonicwall firewall by putting the syntax on browser https://<mgmt-ip>diag.html

    2.  Navigate to GeoIP/Location service

    3. Uncheck the option 'Show block page for geoip and botnet filtering'

    4. Click Accept at the top.

    Image


    With the above changes, the user will get below error message now and firewall will show the initial SYN traffic being dropped as shown :

    Image

    Image


    Related Articles

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    Categories

    • Firewalls > NSa Series
    • Firewalls > NSv Series
    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive 9000 Series

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