26.12.2018

FastNetMon Advanced blackhole persistency during restart

By default, FastNetMon cleans up all blackhole announces during restart/commit operation. But you can disable this behavior and do not unblock blocked hosts during restart.

Please upgrade FastNetMon to latest version 2.0.122 this way:

After that, please enable following features:

Also, it requires small service change if you use systemd based distribution (Ubuntu 16.04 or 18.04). After upgrade process, please open file /lib/systemd/system/fastnetmon.service and put following content into it:

After, please apply changes:

After these changes, FastNetMon will store / load blackhole list during commit / restart operation. Also, new flag do_not_withdraw_unicast_announces_on_restart disables automatic BGP clean up after restart and BGP daemon will keep announces until FastNetMon removes it.