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AW: [CentOS] Securing SSH
by Marc Rebischke 25 Mar '08

25 Mar '08

So I setup ssh on a server so I could do some work from home and I think the second I opened it every sorry monkey from around the world has been trying every account name imaginable to get into the system. What's a good way to deal with this? _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos ######################### - Try to get a static ip from your isp and configure your Firewall only to allow Ssh-Traffic from your static IP-Adress - Take a closer look at "FailBan" to prevent Dictionary Attacks on well known Usernames - Ignore these poor souls (if they have one) Regards Marc Rebischke

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Sendmail novrfy filter by ip address?
by Sean Carolan 25 Mar '08

25 Mar '08

I have a virus and spam filter device that can do VRFY commands to reject invalid email before it gets to the next mail hop. How can I configure the SMTP server to only allow VRFY commands from one particular IP address, and nowhere else? I don't want spammers to be able to hammer on the gateway looking for valid addresses to send to.

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test
by J C 25 Mar '08

25 Mar '08

hello everyone, i just signed up onto the mailing list, testing. nice to meet you all! JC

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question about network repositories
by Rudi Ahlers 25 Mar '08

25 Mar '08

Hi I'm thinking about setting up a local / LAN respository for my CentOS, and probably other (Fedora Core) disto's, but have never done it before, so here's some questions: If I setup a repository, can it hold different distro's / architectures & versions? Say for example, CentOS 4 (i386 & x64), CentOS 5.0 & 5.1 (i386 & x64) - will each one have it's own folder? Will it also be possible to only download the packages that are needed, instead of the whole 4GB repository from the upstream provider? I have some of the CD's or DVD's for all of the distro's, so really only need a few packages now and then, and instead of getting them from the net everytime, get them from the LAN repository? Then, how would I do this? -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stugg

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RHEL on The Pirate Bay, Mininova, etc
by Simon Jolle sjolle 25 Mar '08

25 Mar '08

Hi Centos Users Its _really_ nonsense to release RHEL version on file sharing networks. The only reason why RHEL is so popular on torrent trackers is the lack of knowledge about Centos :-) Conclusion: we should do more marketing :-) cheers Simon

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CentOS 5.1 Live USB NTFS Support
by Mark Rose 25 Mar '08

25 Mar '08

First of all, I was able to use the 5.1 LiveCD to create a bootable USB (8G Lexar FireFly) - thanks to all for your assistance. Question - has anyone been able to add NTFS support to an USB install? It would be a nice to have the ability to access NTFS (and Vista for that matter) disks for troubleshooting and general access. Any and all comments will be appreciated. Thanks! Mark

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moving from RH8 to CentOS5.1
by Ray Leventhal 24 Mar '08

24 Mar '08

Hi all, Is there a way to 'automatically' recreate users/permissions when moving from RH8 (yes, I know...way old) to CentOS5.1 or is it just simpler to recreate the users manually? Total users on this system is < 20. Thanks in advance, -Ray

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CentOS 5.1 on PS3
by James A. Peltier 24 Mar '08

24 Mar '08

Hi All, Does anyone here on the list have CentOS 5.1 running on a PS3? I would like to look at integrating a couple of PS3 nodes into our cluster for it's ability to use the Cell processor inside and was wondering if anyone had any experiences.

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Strange Xen problem
by Louis Lagendijk 24 Mar '08

24 Mar '08

I have a strange problem when using Centos: When using a Xen kernel (it does not matter whether a guest is started or not) networking fails is flakey. ssl connections fail, ping reports a wrong data byte #50 ..... I am using a Sun quad ethernet card, but when I tried the gigabit Ethernet on the motherboard, I do not get the error reports from ping, but many missing replies instead. The behaviour is somewhat intermittent. But now I am using a non-Xen kernel I have no problems. there is nothing logged in /var/log/messages. I had to patch the kernel due to some missing initialisation in the sun hme driver, but as said above there are errors on other cards as well. I am probably overlooking something obvious, but hours of googling have not given any results. Any hints anybody? Louis

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/etc/resolv.conf changes
by vincenzo romero 24 Mar '08

24 Mar '08

Hello all, I'm getting frustrated attempting to understand; I googled and asked folks and am unable to get a straight answer. 1. How is the /etc/resolv.conf file maintained ? I do not seem to get a consistent result when I save resolv.conf configuration from GUI or by hand using vim /etc/resolv.conf. a. Sometimes I the entries toggles between the two entries: # generated by NetworkManager, do not edit! ; Use a local caching nameserver controlled by NetworkManager nameserver 127.0.0.1 b. then when I restart the network services some the /etc/resolv.conf file appears like this: # generated by NetworkManager, do not edit! ; Use a local caching nameserver controlled by NetworkManager search lab.mycompany.com nameserver 192.168.17.2 This host is: - a DNS server that is authoritative for its domain within the 192.168.16/20 network - I believe that even as DNS server, this host should have its resolv.conf file configured to define itself as a DNS server, right? I apologize for the naive questions, but I am a newbie and am unable to gather a straightforward answer. thanks in advance. -- best, Vince

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