Uucp

[columb]

Hi,

Anyone have some experience with UUCP (and possibly protocol "e")?
I'm suspecting that protocol "e" can't handle lots (I mean 40+) concurrent incoming connections, even if number of modems to use is right?
Getting some broken pipes with UUCP and "e" every so often.

(done lots of testing myself, just asking if someone has done any stress tests with UUCP and protocol "e". I can't do any stress test atmo, networks are busy without me playing with them)

(no, couldn't use any packet sniffer yet)

Cheers
Chris

(THIS is not a discussion about other ways of sending files. I know...)

 

[Ted]

Columb
I havent used uucp for YEARS. (unless youre trying to run it across serial links)
These days I prefer SCP or SFTP.
Broken pipes are usually a sign of thr process running out of memory. Not trying to teach you to suck eggs, but are you running out of mem ory or swap space.

Use the top command in linux to look at your system resources - I find it's really useful in conjunction with ps
I hate linux for anything other than boggo stuff - much prefer AIX.
Been doing some fun stuff with xen though - free on rhel5, and ve/ry simple to use

 

[columb]

Yep, UUCP is not best but needs to be used. This point is out of discussion.
I have spend some time reading about UUCP as haven't seen it in use for ages

Re broken pipes. There is lots of ram and swap is never touched. That can't be a problem. Other processes are running fine. As I've said, it looks like UUCP can't handle number of connections. All broken pipes occur within 10 minutes from start of major transfer from 20+ branches.

I do prefer ESX/i for some reason! Meant to look into XEN again BUT no time

Cheers
Chris

 

[columb]

For the record:

it looks like UUCP can't handle 19 concurrent connections.
I'm going to do some tests with 10 connections and then increase by 1 to see what's the maximum number of concurrent connections.

I'm using protocol "e", tried with "i" but "i" is 40-50% slower then "e". Might try with "t" later on.

And for the record: scp going strong! (but seems to be 10% slower then uucp "e")

More tests in progress!

Cheers
Chris

 

[Ted]

Columb
Your piccie of a ship is incorrect - it should be the Ark!!

scp is the way to go! - it will be slower because it is encrypted - if your paths are secure, you could use cp/rcp/ftp.

I like scp because it uses port 22, and is basically the same as ssh.

After all, no-one uses telnet these days........ do they....?

 

[Spinal]

After all, no-one uses telnet these days........ do they....?

telnet towel.blinkenlights.nl

Thank me later

 

[Ted]

Nooooooooooooooooooooooo!!!!!!!!!!!!!!!!!!!!!!!

I remember a site that screened the world cup LIVE via an ascii telnet feed.
You could actually make out some of the players!

Edit: Thank you google!!
http://ascii-wm.net/doc.php#archive

 

[columb]

Columb
Your piccie of a ship is incorrect - it should be the Ark!!

scp is the way to go! - it will be slower because it is encrypted - if your paths are secure, you could use cp/rcp/ftp.

I like scp because it uses port 22, and is basically the same as ssh.

After all, no-one uses telnet these days........ do they....?

Ted,

yeah, I know EXACTLY hoe SPC (or SSH) works
And as I've said in post 1- UUCP must stay for now, there is no discussion about different protocol.
I wouldn't be spending (not cheap) time trying to fix UUCP knowing about other, better protocols to send files.

SCP is not the same as SSH Plus if one can use ftp/cp/etc why not UUCP?

Thanks for heads up!

Cheers
Chris

 

[columb]

Btw. I have clients connecting to AS/400 with telnet.
I've moved whole company from telnet to SSH (putty rules!)

Cheers
Chris

 

[columb]

More to UUCP:

As suspected, UUCP (Taylor's) can't handle 19 concurrent connections over long (more than 10 min) time. And putting UUCP into SSH doesn't help.

Strange thing: It will always drop 1-2 connections, but no more?
I mean if there is a MAX number of connections, it should drop all connections OVER that number.
I'm suspecting buffer overflow but can't prove it (don't know how )

I think that I will write script to replace uucico with scp and just swap it (+ md5sums, uustat to kill queued transfers etc).

Cheers
Chris