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hexicans
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Joined: Thu Nov 26, 2020 10:10 pm

Blackhole

Thu Nov 26, 2020 10:14 pm

Hello everyone,

I come to you because I wonder how to proceed to set up the blackhole on my network.

My forwarder (the only one), informed me that his BGP communities for the blackhole was 65535: 666, and that if I wanted to blackhole an IP to all their forwarders, I had to announce the blackholed IP (/ 32) with these communities.

How to proceed ?

I read on some topics that I should use the filters on mikrotik, but that means that I have to modify the "filter-out" of the peer as well?

Thanks in advance, if anyone can tell me :)

Axel
 
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mrz
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Re: Blackhole

Fri Nov 27, 2020 12:15 pm

add prefix in BGP networks
and set community in out filter.
 
hexicans
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Posts: 2
Joined: Thu Nov 26, 2020 10:10 pm

Re: Blackhole

Fri Nov 27, 2020 4:08 pm

Ok thanks,

Can you tell me what filter must be added ? I'm afraid to do something stupid and set the community on all the prefix or block all the pref
add prefix in BGP networks
and set community in out filter.
 
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mrz
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Posts: 6176
Joined: Wed Feb 07, 2007 12:45 pm
Location: Latvia
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Re: Blackhole

Fri Nov 27, 2020 5:10 pm

/routing filter add chain=your_chain prefix=x.x.x.x/32 set-bgp-communities=65535: 666

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