Is there any docs for vyos firewall?

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1

Hi

Is there any document for vyos’s firewall.

I am confused about some chains or rules, like this one:

chain VYOS_FRAG_MARK {
	type filter hook prerouting priority -450; policy accept;
	ip frag-off & 16383 != 0 meta mark set 0x000ffff1 return
}
  1. when the chain will be used?
  2. why this chain use so much mark bits?
2

check this ressource :
https://docs.vyos.io/en/latest/configuration/firewall/index.html

And if can be usefull, schema for vyos

CHAIN