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SFTP error (perhaps due not to using passive mode?)
by Rogelio Bastardo 15 Aug '07

15 Aug '07

I'm getting a weird error when I try to sFTP on a CentOS box (which I don't have root access). when I run: sftp -oPort=990 user(a)host.domain.com I get the following error, which I suspect is a result of not being in "passive mode" (which works when I use Filezilla on Windows) Connecting to host.domain.com ssh_exchange_identification: Connection closed by remote host Couldn't read packet: Connection reset by peer Any suggestions?

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ssh key with redundant targets?
by Les Mikesell 15 Aug '07

15 Aug '07

Is there a way to tell ssh that it is OK that the target of a command may be one of several machines, not necessarily the one it stuck in ~/.ssh/known_hosts last time around? This might be due to DNS round-robin or an HA failover. Setting StrictHostKeyChecking to no in /etc/ssh/ssh_config allows commands to complete but it still prints the warning which confuses people. -- Les Mikesell lesmikesell(a)gmail.com

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Re: [CentOS] Forcing ifcfg-eth0 to use the same nic in multi nic machine
by David Thompson 15 Aug '07

15 Aug '07

Lanny Marcus wrote: > >I agree with Doug and Johnny. My belief is that every NIC in the world >is supposed to have a unique MAC address. Although the OP has been using >these boards without problems, I suspect there is a defect on the >boards. I've been waiting for the "authoritative network admin" to speak up, but no one has. I believe that as long as the interfaces are connected to different networks, there is no problem having the same MAC address. Connecting two NICs with the same mac address to the same network would be a Bad Thing (tm), as network switches would be confused about where to send packets destined for the MAC address in question. Years ago, Sun workstations with multiple NICs would always have the same MAC address for all the NICs. That being said, it does seem less than helpful on a modern motherboard. I just wanted to point out that it _may_ be an intentional design issue (though I agree a bad one). Cheers, Dave Thompson UW-Madison

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Re: [CentOS] Forcing ifcfg-eth0 to use the same nic in multi nic machine
by Les Bell 15 Aug '07

15 Aug '07

Sorry - I missed the original post - but I can think of one scenario where two NICs have the same MAC address. However, it's extremely unusua.l. The IEEE has managed the allocation of addresses for Ethernet, but IBM has done the same for Token Ring. The two didn't talk, and so their allocated address ranges overlap. Consequently there are a number of pairs of Token Ring and Ethernet cards out there that have the same MAC address. Token Ring/Ethernet bridges have to do some bit-fiddling to map TR MAC's to Ethernet because of it. That's probably not what the OP was enquiring about - unless he's extremely unfortunate and still has to deal with TR. Best, --- Les Bell, RHCE, CISSP [http://www.lesbell.com.au] Tel: +61 2 9451 1144 FreeWorldDialup: 800909

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Re: [CentOS] Forcing ifcfg-eth0 to use the same nic in multi nic machine
by Lanny Marcus 15 Aug '07

15 Aug '07

On 13 August 2007, Johnny Hughes <johnny(a)centos.org> wrote: <snip> > How can 2 nics from different companies have the same mac address .... > I don't think that is possible. > each card needs a separate MAC address, at least the way I understand > networking. I agree with Doug and Johnny. My belief is that every NIC in the world is supposed to have a unique MAC address. Although the OP has been using these boards without problems, I suspect there is a defect on the boards.

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MS Exchange to MBOX
by Joshua Gimer 15 Aug '07

15 Aug '07

We are planning on moving a large amount of Exchange mailboxes to UNIX mbox format. My question is, does anyone know of any projects out there or of any tools that can assist in this conversion? Thanks Josh

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NFS / DNS problem
by Simone 15 Aug '07

15 Aug '07

Hi all, Today we have had a strange problem that has taken down our website, we understand what happened but not why so I am hoping someone has seen this before. We have our web servers (web1 web2 web3 ..... web10) mounting an NFS share (/export/data) from server nfs1. On the web server side we use autofs in the format nfs-dedicated:/export/data where nfs-dedicated is an alias in our internal DNS servers pointing to server nfs1. We run a primary and a secondary DNS (bind) server ns0, ns1 authoritative for our zones and our webservers have them configured in /etc/resolv.conf Today we had to run some upgrade on the dns servers (bios firmwares etc) so we took down ns0 and with it our website went down. All the nfs shares disappeared from the web servers (the logs show requests to mount/unmount timing out), but at the same time on nfs1 the logs show requests (mount and unmount) coming from the web servers and no errors. As soon as ns0 is back up, all gets back to normal. Minutes later we take down ns1 for maintenance and it doesn't have any impact on the website. dig @ns0 nfs-web gives exactly the same results on ns0/1 Back to the office we try to reproduce the same scenario configuring iptables on web3 to block traffic to ns0 but the server (web3) keeps working fine reverting to ns1 for name resolution (as you would expect). Has anybody seen this happening before? Any comment/suggestion much appreciated. Thanks Simone

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dns propagation problem
by Mark Quitoriano 15 Aug '07

15 Aug '07

Im using centos 4.5 and bind 9.2.4-27.0.1.el4, im having a problem propagating updates on domains. when i update the main NS the secondary and tertiary doesn't update automatically. i need to delete the <domain>.zone file in the secondary and tertiary to get update from the main NS. I don't where's the problem i don't get any errors i just dont get the AXFR when the don't delete the file from the backup NS.

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COMPIZ Centos 4.5
by Adriano Frare 15 Aug '07

15 Aug '07

Dear Friends. Is there version COMPIZ (maybe RPM too) for CENTOS 4.5 ? Thanks Adriano Frare

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text installer used in Linux?
by Rogelio Bastardo 15 Aug '07

15 Aug '07

Can someone tell me the name of the text installer used in distros like Debian / Ubuntu? I'd like to create one upon first time boot for a CentOS-based virtual application I'm making. So, after someone boots up, I'd like to have a little GUI thing ask them questions and then put those variables in a file (or maybe use something like sed to edit other network config files).

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