[Cialug] rsync + SSH locking up?

[Nathan C. Smith]

Aren't there are a lot of SSH attacks going on right now too?  Could be a
DoS-type issue?

-----Original Message-----
From: David Champion [mailto:dave at visionary.com] 
Sent: Friday, November 18, 2005 10:48 AM
To: Central Iowa Linux Users Group
Subject: Re: [Cialug] rsync + SSH locking up?


Do a "man ssh" and look at the options for ServerAliveInterval and 
ServerAliveCountMax. I've used those and they seem to make SSH 
connections a bit more robust.

Putty has this also, in the settings under "Connection", it's called 
"seconds between keepalives".

Not all SSH servers support these, OpenSSH does.

-dc

Bailey, Jonathan C wrote:
> I've seen the issue happen once in a while on a LAN, but mostly over 
> cable modem.
> 
> ISPs with the issue:
> Mediacom
> Comcast
> Marshallnet (server is at Marshallnet)
> 
> I'm at a loss at the moment for this one.. It happens internally - no 
> errors or anything else. I'll try your loop and see if that helps.
> 
> 
> Jon
> 
> -----Original Message-----
> From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On 
> Behalf Of Kendall Bailey
> Sent: Friday, November 18, 2005 10:24 AM
> To: Central Iowa Linux Users Group
> Subject: Re: [Cialug] rsync + SSH locking up?
> 
> I use mediacom cable internet, and long transfers of any kind often 
> hang.  I don't think rsync+ssh is any less reliable than wget in my 
> experience, and I use both quite a bit.  With rsync, I use a loop and 
> set a timeout and keep trying until it succeeds, like so
> 
> while true ; do
>    rsync --timeout=45 --rsh=ssh -avz <source> <dest>
>    if [ $? -eq 0 ] ; then break ; fi
> done
> 
> I set up an ssh-agent and use public key auth so that a password isn't 
> needed each time through the loop.
> 
> For simple wget, I use something like
> 
> wget -c --read-timeout=45 <url>
> 
> If something hangs for several seconds, it's been my experience that 
> it does not recover.  I have no idea what to blame, my box, mediacom, 
> some intermediate router(s) or what?  I can tranfer gigs around my 
> home network with no problems, using rsync+ssh.
> 
> Can you give more detail?  Are you having trouble on a LAN or across 
> the internet?
> 
> Kendall
> 
> 
> On 11/17/05, Bailey, Jonathan C <bailj0 at bp.com> wrote:
> 
>>
>>Has anyone on the list ever had an issue with rsync + SSH where the
>>connection hangs after about an hour of transfer? I've seen this issue
> 
> 
>>on different boxes and different configs (all debian-based). Is this
>>some sort of SSH setting or something else?
>>
>>
>>
>>------------------------------
>>Server (n.),
>>   1. Large, extremely expensive machine that goes "Ping!". Measuring
>>at least 25 cubic feet, heavy, bulky and giving of more heat then a 
>>nuclear power plant. It's big, it's bad, it's beautiful and makes it 
>>pretty obvious what happened to this year's IT-budget.
>>
>>Jonathan C Bailey | Elite Customer Solutions USA | Customer Care - POS
> 
> 
>>|
>>(888) BP-HELP-U | (630) 300-5301 x5301 | 150 W Warrenville Rd, MC
>>200-1011T, Naperville, IL 
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>>
> 
> 
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