users February 2007

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[Fwd: Re: More on bittorrent]
by Aaron Konstam 27 Feb '07

27 Feb '07

-------- Forwarded Message -------- From: Aaron Konstam <akonstam(a)sbcglobal.net> To: For users of Fedora <fedora-list(a)redhat.com> Subject: Re: More on bittorrent Date: Mon, 26 Feb 2007 18:35:22 -0600 On Mon, 2007-02-26 at 13:24 -0800, Kam Leo wrote: > On 2/26/07, Aaron Konstam <akonstam(a)sbcglobal.net> wrote: > > On Mon, 2007-02-26 at 10:30 -0800, Kam Leo wrote: > > > On 2/26/07, Aaron Konstam <akonstam(a)sbcglobal.net> wrote: > > > > >> > > > > >>Aaron Konstam wrote: > > > > >> I wanted to download the latest FC6 respin CDs. I went to the web > > > > >> location and found the correct bittorrent and clicked to download it. > > > > >> The bittorrent GUI opened and the download started. Now I was > > > > connected > > > > >> to a system with an Internet speed of 45 Mb/s but the GUI said the > > > > >> download would take 15 hours. Well the respin has 5 CDs. I have a > > > > >> downloaded a single 600+ Meg CD in less than an hour (actually I > > > > think > > > > >> it was much less). So I can't understand why the bittorrent download > > > > >> should take 15 hours. > > > > >> > > > > >> I have done this before but it has been a long time ago. I must be > > > > doing > > > > >> something wrong but what? Any ideas? > > > > > > > > > >A couple of things to check - do you have a download speed limit > > > > >set, so that it does not use the full bandwidth when downloading? Do > > > > >you have your firewall properly configured so that you can seed as > > > > >well as download? If not, this can limit your download speed. How > > > > >many seeds are there, compared to the number of clients, and how > > > > >many are you connected to? > > > > My download speed was set too high. I have no firewall set on my machine > > > > but the university does however they tell me that they do not restrict > > > > bittorrents. I don't know how to check the number of seeds and /or > > > > number of clients. > > > > > > > > So there are clearly holes in my knowledge. Can someone help fill in the > > > > gaps. > > > > > > > > > >One other thing to keep in mind is that the time estimate when you > > > > >first start downloading is usually high, and drops as you connect to > > > > >more feeds. It also tends to change during the download. Depending > > > > >on how the client calculates the time remaining, it may get less > > > > >sensitive to rate changes as the download progresses - more data to > > > > >average, so temporary fluctuations in download speed do not affect > > > > >it as much. > > > > The above is true but I waited 2 hours and not even 1 CD was downloaded. > > > > > > > > > > Bittorrent works when there are a large number of seeders and peers. > > > The problem with the Fedora respin is that after the initial > > > availability announcement the number of seeders and peers drops to a > > > very low number, less than 5 when I tried it. If each shares the > > > minimum required upload speed, 4K bits/second, the total bandwidth is > > > only 20K bits/second. Factor the low number of participants and the > > > problem of finding peers with the fragments missing from your download > > > and you get the current situation. Also I find that the tracker used > > > by Fedora respin does not work well with my setup which is behind a > > > firewall. > > > > > So am I conclude that >10 hours may be what it will take. How do you > > find out how many seeders are active? > > -- > > Use Azureus. It shows the number of seeders and peers connected to your swarm. That is ok if I can figure out how. How do you get azureus to download a bittorrent at a web site? -- ======================================================================= The wise and intelligent are coming belatedly to realize that alcohol, and not the dog, is man's best friend. Rover is taking a beating -- and he should. -- W.C. Fields ======================================================================= Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam(a)sbcglobal.net

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Is it possible to steal your SSH key?
by Peter Kiem 27 Feb '07

27 Feb '07

Hi, Just wondering something... If you connect to a compromised server using SSH keys (not passwords) is it possible for the compromised server to record your SSH key so they can use it on other servers you log into? Opinions? -- Regards, Peter Kiem Zordah IT - IT Consultancy and Internet Services Ph: (0414) 724-766 Fax: (07) 3344-5827 Web: www.zordah.net Email: zordah(a)zordah.net

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Authenticate `su -` through PAM and SSH Agent
by Justin Willmert 27 Feb '07

27 Feb '07

I'd appreciate it if anybody would tell me if there is a way to use PAM to authenticate a user when using `su -`. After reading about ssh agent a while ago, I've had this idea that it'd be a perfect way to add another layer of security around my server. Currently I use ssh keys to log in remotely as my user. In my mind, using ssh agent instead of passwords would be the next logical step. I'm not very familiar with ssh agent and rsa authentication methods though. I've got a rough idea of what I'm looking for, but one of you may be able to direct to me why my plan isn't safe/wouldn't work. This is what I've been thinking: I currently have my ssh key for my user allowing me to login to my server (encrypted with a password of course). I enable ssh agent forwarding in PuTTY or ssh (depending on whether I'm in Windows or FC6 at the time). I'd then issue a `su -` at the prompt and it'd authenticate against the ssh agent I have running locally, and if I didn't have it running, I'd be denied access. Thanks for any suggestions or help, Justin W

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How much swap?
by Uno Engborg 27 Feb '07

27 Feb '07

I am wondering how much swap space I need in modern Linux such as FC6. I'm planning to set up a system Pentium Dual Core with 8G RAM, and I don't expect I need much more than that for my apps. Would I need a swap anyway. There is some old rule of thumb to have twice as much virtual memory as you have physical RAM, but that sounds a bit ridiculous as it would take a lot of time to swap in/out this much memory from disk. In some other Unixes the swap space was needed to preserve dump information in case of a panic, are there any such considerations in Linux? Regards Uno Engborg

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Re: cd installs under FC6 fail
by Kwan Lowe 27 Feb '07

27 Feb '07

>> It sounds like a DOS/UNIX linefeed issue. You can try specifying the shell: >> >> sh MathInstaller >> >> I believe that there are also mount options that can convert linefeeds >> automatically >> so perhaps that could help. >> >> -- >> * The Digital Hermit http://www.digitalhermit.com >> * Unix and Linux Solutions kwan(a)digitalhermit.com >> > > Is your cd mounted with noexec option? > Ill wager that's the problem! I'd forgotten about this and it has bitten me before. -- * The Digital Hermit http://www.digitalhermit.com * Unix and Linux Solutions kwan(a)digitalhermit.com

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Re: Error, but uname -r give different indications
by Alan Cox 26 Feb '07

26 Feb '07

On Mon, 26 Feb 2007 23:42:48 +0200 "Peter Lauri" <lists(a)dwsasia.com> wrote: > Yes now it works, it is starting to update. However, new problem: > > warning: /etc/passwd created as /etc/passwd.rpmnew > warning: /usr/lib/security/classpath.security created as > /usr/lib/security/classpath.security.rpmnew > warning: /etc/pam.d/system-auth created as /etc/pam.d/system-auth.rpmnew > > What does that actually mean? Could I just copy the passwd to passwd.bak and > then rename passwd.rpmnew to passwd? And same for the others? When rpm finds a configuration file has been updated it creates the new one as .rpmnew rather than stomping on the old one. This is usually the right thing to do as you don't for example want it to remove all your users and passwords by replacing them with a new empty password file...

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Slightly OT: w2k Time Zone Updating
by taharka 26 Feb '07

26 Feb '07

Anyone on the list updating w2k time zones using the $microsoft Time Zone Editor? If so, has anyone tried using the Time Zone Editor on a win98SE system with success? taharka Lexington, Kentucky U.S.A.

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Postfix + ClamAV + SpamAssassin
by Luc MAIGNAN 26 Feb '07

26 Feb '07

Hello all, I'm looking for a HOWTO which explains integration beetween Postfix, ClamAV and SpamAssassin (Fedora Core 6) Thanks for any help BR

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Re: cd installs under FC6 fail
by Kwan Lowe 26 Feb '07

26 Feb '07

> Message: 11 > Date: Mon, 26 Feb 2007 13:26:41 -0500 > From: Jack Howarth > > I am seeing an odd problem under x86_64 FC6. A number > of different programs that I have tried to install from > CD have all failed with the error message of the form... > > sh: ./MathInstaller: /bin/sh: bad interpreter: Permission denied > It sounds like a DOS/UNIX linefeed issue. You can try specifying the shell: sh MathInstaller I believe that there are also mount options that can convert linefeeds automatically so perhaps that could help. -- * The Digital Hermit http://www.digitalhermit.com * Unix and Linux Solutions kwan(a)digitalhermit.com

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Error, but uname -r give different indications
by Peter Lauri 26 Feb '07

26 Feb '07

When I try to update from FC5 to FC6 I get this: Error: hal conflicts with kernel < 2.6.17 Error: autofs conflicts with kernel < 2.6.17 However, when I do: uname -r I get: 2.6.19-1.2911.fc6 With yum list | grep kernel I get: kernel.i686 2.6.19-1.2911.fc6 installed kernel-smp.i686 2.6.15-1.2054_FC5 installed kernel-smp.i686 2.6.18-1.2239.fc5 installed kernel.i586 2.6.19-1.2911.fc6 updates kernel-PAE.i686 2.6.19-1.2911.fc6 updates kernel-PAE-debug.i686 2.6.19-1.2911.fc6 updates kernel-PAE-debug-devel.i686 2.6.19-1.2911.fc6 updates kernel-PAE-devel.i686 2.6.19-1.2911.fc6 updates kernel-debug.i686 2.6.19-1.2911.fc6 updates kernel-debug-devel.i686 2.6.19-1.2911.fc6 updates kernel-devel.i586 2.6.19-1.2911.fc6 updates kernel-devel.i686 2.6.19-1.2911.fc6 updates kernel-doc.noarch 2.6.19-1.2911.fc6 updates kernel-headers.i386 2.6.19-1.2911.fc6 updates kernel-kdump.i686 2.6.19-1.2911.fc6 updates kernel-kdump-devel.i686 2.6.19-1.2911.fc6 updates kernel-xen.i686 2.6.19-1.2911.fc6 updates kernel-xen-devel.i686 2.6.19-1.2911.fc6 updates yum-kernel-module.noarch 1.0.3-1.fc6 extras I am confused, and a newbie. Best regards, Peter Lauri <http://www.dwsasia.com/> www.dwsasia.com - company web site <http://www.lauri.se/> www.lauri.se - personal web site <http://www.carbonfree.org.uk/> www.carbonfree.org.uk - become Carbon Free

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