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FortiGate periodically connects to the remote HTTP server to retrieve the latest URL list.
Expectations, Requirements.
External Resources need to meet the following requirements:
- The external resource file will be a plaintext format file, and each URL will be in a single line.
- Each line can be an IP address or a subnet.
- The file is limited to 10M.
- The maximum number of lines is limited to 128K (128 x 1024 entries).
- The line length limit is 4K characters.
- The entries limited also follow table size limitation defined by CMDB per model.
Configuration.
- Configure the external resource from CLI:
# config system external-resource
edit "External-resource-files"
set type address
set resource "http://10.104.3.130/resources/urls"
set refresh-rate 2
next
end
Note.
FortiGate connects to the remote HTTP server every 2 minutes (set refresh-rate 2).
- Enable external resources on DNS Filter profile.
# config dnsfilter profile
edit "default"
set external-ip-blocklist "External-resource-files"
next
end
Verification.
Open an SSH session via PuTTY per Master and Slave unit and run the below command on both units:
FGT # fnsysctl ls -l /var/log/external/
-rw-r--r-- 1 0 0 Mon Apr 25 04:15:19 2022 15762 ext-root.External-resource-files
-rw-r--r-- 1 0 0 Mon Apr 25 04:15:19 2022 33 ext-root.External-resource-files.csum
-rw-r--r-- 1 0 0 Mon Apr 25 04:15:19 2022 35 ext-root.External-resource-files.etag
Here is the HA log massage where the units are out of syn due "external-files" when FGT connect to the HTTP or HTTPS server to get the latest URL list:
date=2022-04-25 time=04:15:41 id=7090343938808087133 itime="2022-04-25 04:15:43" euid=3 epid=3 dsteuid=3 dstepid=3 logver=700020234 logid=0108037903 type="event" subtype="ha" level="information" msg="The sync status with the primary" logdesc="Synchronization status with primary" sync_type="external-files" sync_status="out-of-sync" eventtime=1650849342264133363 tz="+0300" devid="FG1K5DT365987569" vd="root" dtime="2022-04-25 04:15:41" itime_t=1650849343 devname="FW1"
Related article:
https://docs.fortinet.com/document/fortigate/6.2.0/cookbook/790156/external-resources-for-web-filter
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