IWETHEY v. 0.3.0 | TODO
1,095 registered users | 0 active users | 0 LpH | Statistics
Login | Create New User
IWETHEY Banner

Welcome to IWETHEY!

IWETHEY Home / IWETHEY Board / Networking Forum / On experimenting...
Post #202,947
by pwhysall
Picture of pwhysall
4/12/05 12:55:17 AM
Reply
New On experimenting...
.. I discover that this works - against my expectations.

Conclusion? eth0 isn't going down properly.

If it went down, you wouldn't be connected any more.

Peter
[link|http://www.ubuntulinux.org|Ubuntu Linux]
[link|http://www.kuro5hin.org|There is no K5 Cabal]
[link|http://guildenstern.dyndns.org|Home]
Use P2P for legitimate purposes!
Post #202,956
by static
4/12/05 2:00:43 AM
Reply
New I disagree on your analysis.
I think that sshd is holding onto state despite the network device vanishing. However, the down/up restores the network device long before sshd decides to discard the session. After all, an ifdown does make the device "not exist" as eth0: its IP address is not bindable, the routes are removed, etc etc.

It might also be the OS leaving the connection open *as far as the sshd process is concerned* although I'm sure it would get copious errors were it to try to use it whilst the device was disabled.

Wade.

Is it enough to love
Is it enough to breathe
Somebody rip my heart out
And leave me here to bleed
 
Is it enough to die
Somebody save my life
I'd rather be Anything but Ordinary
Please

-- "Anything but Ordinary" by Avril Lavigne.
Post #202,963
by pwhysall
Picture of pwhysall
4/12/05 5:07:53 AM
Reply
New Re: I disagree on your analysis.
If sockets are open and working, then the interface ain't down.

Peter
[link|http://www.ubuntulinux.org|Ubuntu Linux]
[link|http://www.kuro5hin.org|There is no K5 Cabal]
[link|http://guildenstern.dyndns.org|Home]
Use P2P for legitimate purposes!
Post #202,972
by broomberg
4/12/05 6:40:14 AM
Reply
New This is how I handle the issue
I often will do "nohup /etc/init.d/network restart".
I lose my connection but the process keeps going due to the nohup.
Post #202,973
by pwhysall
Picture of pwhysall
4/12/05 7:01:21 AM
Reply
New Ar, that's what I do
Of course, if summat breaks you're knackered, but hell, exercise is good for you.

Peter
[link|http://www.ubuntulinux.org|Ubuntu Linux]
[link|http://www.kuro5hin.org|There is no K5 Cabal]
[link|http://guildenstern.dyndns.org|Home]
Use P2P for legitimate purposes!
Post #203,048
by folkert
Picture of folkert
4/12/05 3:05:54 PM
Reply
New Nope, I disagree.
The interface goes down.

SSH server buffers the requests until it can get back through. As long as the tunnel construction hasn't failed it should still be there... It is sort of like pushing stop on your DVD once. When you remove and re-insert the DVD, the DVD Player starts exactly where left off.

It is the same idea, just implemented in Network protocol. Of course Timeouts apply with SSH but the DVD only fails when power has been removed.
--
[link|mailto:greg@gregfolkert.net|greg],
[link|http://www.iwethey.org/ed_curry|REMEMBER ED CURRY!] @ iwethey

[link|http://it.slashdot.org/comments.pl?sid=134485&cid=11233230|"Microsoft Security" is an even better oxymoron than "Military Intelligence"]
No matter how much Microsoft supporters whine about how Linux and other operating systems have just as many bugs as their operating systems do, the bottom line is that the serious, gut-wrenching problems happen on Windows, not on Linux, not on Mac OS. -- [link|http://www.eweek.com/article2/0,1759,1622086,00.asp|source]
Post #204,039
by jake123
4/20/05 10:45:18 AM
Reply
New It works like that with warp, too
I've done that particular trick on the box in the basement before.
--\n-------------------------------------------------------------------\n* Jack Troughton                            jake at consultron.ca *\n* [link|http://consultron.ca|http://consultron.ca]                   [link|irc://irc.ecomstation.ca|irc://irc.ecomstation.ca] *\n* Kingston Ontario Canada               [link|news://news.consultron.ca|news://news.consultron.ca] *\n-------------------------------------------------------------------
     Note to self: don't type "ifdown eth0" over SSH. -NT - (FuManChu) - (12) - April 12, 2005, 12:27:17 AM EDT
         ifdown eth0; ifup eth0 works. Over ssh. I've done that. -NT - (static) - (11) - April 12, 2005, 12:31:37 AM EDT
             You weren't connected via eth0, then ;-) -NT - (pwhysall) - (10) - April 12, 2005, 12:40:48 AM EDT
                 Yes. Yes, I was. Actually, I've done it several times. - (static) - (8) - April 12, 2005, 12:43:05 AM EDT
                     I thought of that too late (worked for me in the past too) -NT - (FuManChu) - April 12, 2005, 12:45:38 AM EDT
                     On experimenting... - (pwhysall) - (6) - April 12, 2005, 12:55:17 AM EDT
                         I disagree on your analysis. - (static) - (5) - April 12, 2005, 02:00:43 AM EDT
                             Re: I disagree on your analysis. - (pwhysall) - (4) - April 12, 2005, 05:07:53 AM EDT
                                 This is how I handle the issue - (broomberg) - (1) - April 12, 2005, 06:40:14 AM EDT
                                     Ar, that's what I do - (pwhysall) - April 12, 2005, 07:01:21 AM EDT
                                 Nope, I disagree. - (folkert) - (1) - April 12, 2005, 03:05:54 PM EDT
                                     It works like that with warp, too - (jake123) - April 20, 2005, 10:45:18 AM EDT
                 I concur. I have done it many times. - (folkert) - April 12, 2005, 03:01:43 PM EDT

I don't get no respect!
44 ms