ack prioritization
I would like to prioritize ACK packets for DSL link. I am using NAT on that MT box. Where to put ACK packet marking rule? on prerouting or postrouting??
Re: ack prioritization
I know what to mangle, but my question was: what chain? prerouting or postrouting?use tpc flags in magle advanced
Re: ack prioritization
May i ask why? I'm too doing TCP ACK prioritization, and have the mangle rules done in prerouting. Whats the difference?in postrouting must be.
Just curious whats, the packet size you use? I'm using just the no piggybacked ones (0-40 bytes).
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jamchan_hn
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Re: ack prioritization
because the ack it happens when the conexion is established, already passage by the routes
Re: ack prioritization
Correct TCP ACK prioritization is currently not possible with RouterOS.
It won't let you accurately match tcp ack packets with zero data length.
Perhaps you could ask support@ for it?
A few versions had "u32" support which would have let us match those packets accurately but they removed that support.
It won't let you accurately match tcp ack packets with zero data length.
Perhaps you could ask support@ for it?
A few versions had "u32" support which would have let us match those packets accurately but they removed that support.
Re: ack prioritization
I'm newbie with ROS, but... I'm using it right now with this mangle rule before all connection marking ones:Correct TCP ACK prioritization is currently not possible with RouterOS.
It won't let you accurately match tcp ack packets with zero data length.
Perhaps you could ask support@ for it?
A few versions had "u32" support which would have let us match those packets accurately but they removed that support.
Code: Select all
0 chain=prerouting action=mark-packet new-packet-mark=tcp_ack passthrough=no tcp-flags=ack
in-interface=Lan1 protocol=tcp packet-size=0-40
TL
Re: ack prioritization
I'm not sure i understand you entirely.
You don't need connection marks only packet marks.
PS: 40 byte tcp packets with ack flag set are tcp packets without tcp options (SACK, window scaling, timestamps).
You don't need connection marks only packet marks.
PS: 40 byte tcp packets with ack flag set are tcp packets without tcp options (SACK, window scaling, timestamps).
Re: ack prioritization
So, these are the ACK packets we want to prioritize aren't they? I mean, my goal is just to optimize the downstream even when the upstream channel is full on a ADSL link, so only these ACKs interest me.PS: 40 byte tcp packets with ack flag set are tcp packets without tcp options (SACK, window scaling, timestamps).
This page explains this in more detail: http://www.benzedrine.cx/ackpri.html
TL
Re: ack prioritization
Re: ack prioritization
what you also need is to mark packets with flags:
fin,syn,rst,psh,ack,urg/ack
and
fin,syn,rst,psh,ack,urg/syn
unfortunately, mikrotik routeros can't mark urg/ack or urg/syn.
at least I don't know how to do it.
or maybe we're all misunderstanding, and by having 'tcp-flags=ack,fin,syn,rst,psh,ack,urg' we kill the two above birds with one stone.
which I doubt
cheers!
fin,syn,rst,psh,ack,urg/ack
and
fin,syn,rst,psh,ack,urg/syn
unfortunately, mikrotik routeros can't mark urg/ack or urg/syn.
at least I don't know how to do it.
or maybe we're all misunderstanding, and by having 'tcp-flags=ack,fin,syn,rst,psh,ack,urg' we kill the two above birds with one stone.
which I doubt
cheers!