fun networking: tcp close
source link: https://dannypsnl.github.io/blog/2018/11/30/cs/fun-network-tcp-close/
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Recently we are working on a new feature is about filter packets by HTTP header for our router. This is the concept, we read the header by…fun networking: tcp close
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Programming Language Theory • System Programming
fun networking: tcp close
Recently we are working on a new feature is about filter packets by HTTP header for our router. This is the concept, we read the header by rules, rules are just some key/value pair. If key missing or value isn't matched, then we drop the packet.
When a connection end, we would remove this connection from allowing pass map.
Anyway, we found a bug is, we use FIN flag to say this packet is the end of the TCP connection,
but we know a connection end is a:FIN -> b:ACK -> b:FIN -> a:ACK, a/b is client/server here.
So except the first packet, following packets won't pass our router,
then connection would never end until timeout, lol.
author: Lîm Tsú-thuàn/林子篆/Danny
category:cs
tag:workrecordnetworkingtcp
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