Re: wrapper script to use cvs/scp through a ssh gateway

From: Darren Tucker (dtucker_at_gate.dodgy.net.au)
Date: 09/29/05 

Date: 29 Sep 2005 06:33:44 GMT

On 2005-09-29, Ron! <anemail@spam.net> wrote:
> i simply said that tunneling an ssh through another ssh will add some
> overhead. from the ping output it's actually neglible, and for all intents
> and purposes meaningless in real word applications, unless those
> applications are real time...

That's true, but in the OP's configuration they already have 2 ssh
tunnels so there's probably not even that.

> actually, that wasn't me, that was the original poster... i have no interest
> in starting an argument... i simply mentioned that ssh itself as a protocol
> has a noticeable impact on performance and response times (maybe not in so
> many words)... adding another ssh layer will also add additional overhead...
> that's all i said...

Ah, sorry, I got your reply mixed up with the OP's.

It's true that ssh adds some protocol overhead but it's most noticable
in connection establishment. The overhead of encryption and MAC is
relatively low (on modern processors, both can be done at tens of
megabytes per second in software).

> i will include here my entire previous comment:
>
> "not only that, but if that's the option, mine as well use a modem
> because of
> the performance impact (i know, text, small issue, but it would be an
> issue
> to me, especially of your additionally going to port forward)..."

I found the "mine as well" part misleading (it was part of the reason
I mixed you up with the OP).

Are you saying that an SSH connection over a relatively fast medium
(ethernet, xDSL, cable) is no faster than an analogue modem? That's
certainly not my experience. 

-- 
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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