What is 'UDP acceleration' ?

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buranded
Posts: 2
Joined: Wed May 07, 2014 12:13 pm

What is 'UDP acceleration' ?

Post by buranded » Wed May 07, 2014 12:24 pm

Hello,
please explain, what is 'UDP acceleration' ?

Бурановский Дедушка. ;o)
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thisjun
Posts: 2458
Joined: Mon Feb 24, 2014 11:03 am

Re: What is 'UDP acceleration' ?

Post by thisjun » Wed May 14, 2014 6:08 am

If you use UDP acceleration you can get good result of throughput.
And UDP is using for NAT-traversal.

buranded
Posts: 2
Joined: Wed May 07, 2014 12:13 pm

Re: What is 'UDP acceleration' ?

Post by buranded » Sun Jun 15, 2014 10:15 am

thisjun wrote:
> If you use UDP acceleration you can get good result of throughput.
> And UDP is using for NAT-traversal.

But this is not acceleration,
it is just speed loss prevention in conparison with
unvpnned user traffic.

IP-over-UDP = no speed loss, just small overhead about 28 bytes/pkt
(ip header + udp header of carrier udp packet + maybe some bytes for
crypting salt)

IP-over-TCP = ugly speed loss and overhead due to carrier session TCP ACKS for each internal data portion and speed limit over single TCP session

hmdz
Posts: 1
Joined: Sun Dec 11, 2022 8:40 am

Re: What is 'UDP acceleration' ?

Post by hmdz » Sun Dec 11, 2022 8:48 am

Very True! VPNs should use UDP by default and not TCP because of TCP-meltdown and the TCP overhead. Most VPNs are UDP based and that is why they are very fast.

Enabling UDP on SoftEther is more of a hack than the default behaviour. But it results in substantial speed gains compared to the default TCP mode.

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