Discuss September 2008

discuss@lists.centos.org

264 participants
315 discussions

RE: [CentOS] Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

---------- Original Message ---------------------------------- From: "RobertH" <roberth(a)abbacomm.net> Reply-To: CentOS mailing list <centos(a)centos.org> Date: Tue, 9 Sep 2008 12:32:33 -0700 >> >> I got my information about the MTU setting from doing google searches and >> the message boards on broadband reports as well as doing the tweak test on >> broad band reports. >> >> > >It appears you are on Comtrash where everything is CoMtRaSHtIc. > >Good for you. Dance a jig. > >Stop beating the MTU horse to death and get busy finding out how to best >connect to the CPE devices. > >Google that stuff. > >First, when testing, disable (admin down) the internal network on the second >nic > >Also, check to see what specific nics you have an if any recent issues with >kernels and such and any updates. > >Google that too. > >Then Focus on the internet transit/transport infrastructure. > >Find out best way to interface with the cable modem CPE infrastructure. > >Meaning what speed and duplex. > >Trial and error. > >You will get there... > >Some nics need to be played with and dealt with in terms of kernel and other >things like disable ipv6 in modprobe.conf and dhcp... > >You might be better off having an intermediate device between you and the >cable modem if your nics don't wanna play nice with the cable modem. > >Last but not least, you can always check stats and see if collisions and >errors on interfaces and more. > >Enjoy > > - rh > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos > 1. Comcrap is not available in my area I am on road runner biz through bright house with 15m down and 2 up and static ip. 2. Already tested without the internal nic running 3. Tried with a router in between and the result is the same. 4. I do agree about the negotiation aspect, which I'm looking into as well. 5. Don't notice any collisions or errors on ifconfig. ________________________________________________________________ Sent via the WebMail system at mail.dsli.com

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Re: [CentOS] Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

---------- Original Message ---------------------------------- From: Les Mikesell <lesmikesell(a)gmail.com> Reply-To: CentOS mailing list <centos(a)centos.org> Date: Tue, 09 Sep 2008 15:46:53 -0500 >David Petruzzella wrote: >> >> I got my information about the MTU setting from doing google searches and the message boards on broadband reports as well as doing the tweak test on broad band reports. > >MTU's need to match the lowest value in the path between endpoints not >just your adjacent connection. If there are tunnels/PPOE that add >encapsulating headers involved you'll have a performance hit when the >routers need to fragement and reassemble large packets. > >-- > Les Mikesell > lesmikesell(a)gmail.com > > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos > No tunnels. ________________________________________________________________ Sent via the WebMail system at mail.dsli.com

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RE: [CentOS] Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

---------- Original Message ---------------------------------- From: Ric Moore <wayward4now(a)gmail.com> Reply-To: CentOS mailing list <centos(a)centos.org> Date: Tue, 09 Sep 2008 14:56:58 -0400 > >On Mon, 2008-09-08 at 23:46 -0600, Joseph L. Casale wrote: >> >I have a server with dual nic's running centos 5.2 1 nic connects to the >> >cable modem, which has 15m d and 2m up, but speed tests barely come back at >> >5mb down including road runner's internal speed test. I hook up my laptop to >> >the same modem, same port, using the same cable and I get 17mb down. I have >> >ruled out iptables, nics (because same result on both nics), cables, cable >> >modem(with a brighthouse rep) any suggestions would be greatly appreciated. >> >Thanks. >> >> So I gather the nics aren't teamed from your wording, maybe MTU is set sub >> optimal for your particular ISP? What OS on your laptop? Wrong MTU can have >> a significant effect such as this. > >"Back in the day..." there used to be a utility that would test your >connection for the optimal MTU setting. Is there something like that for >Linux?? Ric > >-- >---------------------------------------------------- >My father, Victor Moore (Vic) used to say: >"There are two Great Sins in the world... >..the Sin of Ignorance, and the Sin of Stupidity. >Only the former may be overcome." R.I.P. Dad. >Linux user# 44256 Sign up at: http://counter.li.org/ >https://nuoar.dev.java.net/ >Verizon Cell # 336-254-1339 > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos > I got my information about the MTU setting from doing google searches and the message boards on broadband reports as well as doing the tweak test on broad band reports. ________________________________________________________________ Sent via the WebMail system at mail.dsli.com

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RE: [CentOS] Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

---------- Original Message ---------------------------------- From: "RobertH" <roberth(a)abbacomm.net> Reply-To: CentOS mailing list <centos(a)centos.org> Date: Tue, 9 Sep 2008 13:19:41 -0700 >> >> 1. Comcrap is not available in my area I am on road runner biz through >> bright house with 15m down and 2 up and static ip. >> >> 2. Already tested without the internal nic running >> >> 3. Tried with a router in between and the result is the same. >> >> 4. I do agree about the negotiation aspect, which I'm looking into as >> well. >> >> 5. Don't notice any collisions or errors on ifconfig. >> >> > >I see, when I trace the domain you are sending email from I assumed it was >you on a comcast link. > >Or maybe roadrunner resells comcast in your area or comcast bought >roadrunner in your area? > >The dlsi.com dig pointing at 0.0.0.0 was interesting. > >Never ever seen dns point to 0.0.0.0 > >Shouldn't there be a error catch in dns server software for that situation? > >It's like using dns to route? Har har he. > >Or did you buy the internet? > >;-) > >Man, if so, I wanna be your best bud cause I need a piece of the action to >sell at a good deal > >;-> > > - rh > > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos > LOL I wish I bought the internet, no this dsli.com e-mail address is because I used to have dsl service with them when they were a national provider back when there were clec's, but when all the clec's went poof they could not keep the dsl side of it, but as a sign of gratitude they let me and my wife keep the e-mail account. My domain is actually pbfamily.net ________________________________________________________________ Sent via the WebMail system at mail.dsli.com

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grub permission denied
by Jay 09 Sep '08

09 Sep '08

I have one server that I can not edit the /etc/grub/grub.conf file. I get permission denied as root. I can change other files just not grub.conf. after unmounting /dev/hda from /boot and mounting under /g for a test the same things occurs. Even in single mode I can not modify / delete / move the file. When umounted I did a fsck on it and all is fine. also can not edit menu.lst which links to grub.conf. what am I missing? Thanks -Jay

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DJB's daemontools package
by Robert Moskowitz 09 Sep '08

09 Sep '08

Is this available for Centos? If so where?

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CentOS 4 & autofs 4.1.3
by John Kordash 09 Sep '08

09 Sep '08

For those of you using CentOS 4, is anyone having trouble with autofs 4.1.3? I'm seeing (with 60second unmount timeout) what appears to be an apparent race condition where a script touches an automount directory at about (the same second according to logs) the same time the unmount is triggered, and the script then gets a read error. Sure, increasing the unmount timeout will reduce the occurrence rate, but if this really is a race, then it won't eliminate it. In looking at the CHANGELOG between autofs 4.1.3 and 5.0.1rc2, there have been tons of changes including some references to timing issues. However nothing is jumping out, and there are many changes. Is it conventional wisdom that the 4.1.3 autofs has 'issues' and folks routinely move up to autofs 5 on CentOS 4.x? Thanks, -John

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RE: [CentOS] Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

Not a laptop it is a server with dual nics mtu set at 1500, 1 nic directly to the cable modem the other to my lan. ---------- Original Message ---------------------------------- From: "Joseph L. Casale" <JCasale(a)activenetwerx.com> Reply-To: CentOS mailing list <centos(a)centos.org> Date: Mon, 8 Sep 2008 23:46:40 -0600 >>I have a server with dual nic's running centos 5.2 1 nic connects to the >>cable modem, which has 15m d and 2m up, but speed tests barely come back at >>5mb down including road runner's internal speed test. I hook up my laptop to >>the same modem, same port, using the same cable and I get 17mb down. I have >>ruled out iptables, nics (because same result on both nics), cables, cable >>modem(with a brighthouse rep) any suggestions would be greatly appreciated. >>Thanks. > >So I gather the nics aren't teamed from your wording, maybe MTU is set sub >optimal for your particular ISP? What OS on your laptop? Wrong MTU can have >a significant effect such as this. > >jlc >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos > ________________________________________________________________ Sent via the WebMail system at mail.dsli.com

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RE: [CentOS] Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

---------- Original Message ---------------------------------- From: "Joseph L. Casale" <JCasale(a)activenetwerx.com> Reply-To: CentOS mailing list <centos(a)centos.org> Date: Tue, 9 Sep 2008 12:40:48 -0600 >>Not a laptop it is a server with dual nics mtu set at 1500, 1 nic directly to the cable modem the other to my lan. > >MTU has nothing to do with laptops, it has to do with TCP/IP. >Aside from a previous posters duplex setting (good catch on his part) its >possible that MTU is an issue. Some ISP's do some silly stuff. You >*are* going into a cable modem (which I read as accessing the internet >through some means other than a high-end fiber/etc connection where oddities >wouldn't likely exist:>) > >jlc >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos > The MTU setting of 1500 is optimal for that connection from what I read and according to tweak tests and I was just clarifying that the pc in question was not a laptop I am aware that MTU is TCP related and I agree sometimes there are funny things that happen with that, based on other tests I have done with other devices kind of rules out MTU it seems to be more a duplexing issue or driver issue I think. Both myself and the cable guy have hooked a laptop to the cable modem all beit they are windows laptops with the same settings and speed tests were normal. ________________________________________________________________ Sent via the WebMail system at mail.dsli.com

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Need help with an odd issue I am experiencing
by David Petruzzella 09 Sep '08

09 Sep '08

I have a server with dual nic's running centos 5.2 1 nic connects to the cable modem, which has 15m d and 2m up, but speed tests barely come back at 5mb down including road runner's internal speed test. I hook up my laptop to the same modem, same port, using the same cable and I get 17mb down. I have ruled out iptables, nics (because same result on both nics), cables, cable modem(with a brighthouse rep) any suggestions would be greatly appreciated. Thanks.

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Discuss September 2008