Discuss October 2009

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338 participants
325 discussions

vncviewer and IPv6
by Robert Moskowitz 01 Oct '09

01 Oct '09

I have a host that I have been accessing with vncviewer via its fqdn that had only an IPv4 A record. I just added a AAAA IPv6 record, and vncviewer via fqdn stopped working. But worked when I provided the IPv4 address instead. It LOOKS like vncviewer is trying the IPv6 address, eventhough all documentation indicates that it does not support IPv6. Definitely my server is only listening on the IPv4 interface. SSH has a nice -4 option to force using IPv4; there is no similar option for vncviewer. Does anyone have any idea on how to enforce IPv4 usage for IPv6-dead vncviewer? Yes, I DO want IPv6 on this server....

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Any known problems with kernel-2.6.18-164.el5.x86_64 / x86_64 / 3ware?
by mbneto 01 Oct '09

01 Oct '09

Hi, I have a server that is running centos 5.3 x86_64 that until last week was running fine. With no error messages in console and in /var/log/messages the server simply stops responding. After a reboot everything is fine. The only change (that I could find) but that was not active before the first incident/reboot was the update of the kernel and friends. The server (is this can help) is a intel quad core, 8GB RAM , 3 x 1TB disks (raid mirror with 2 active / 1 spare via 3ware controller) Any known problem with the kernel-2.6.18-164.el5.x86_64? (I am assuming that this would be the only thing that could cause the problem due to the lack of other messages. Regards. yum.log Sep 24 12:13:48 Updated: openssl-0.9.8e-12.el5.x86_64 Sep 24 12:13:49 Updated: mysql-5.0.77-3.el5.x86_64 Sep 24 12:13:49 Updated: nspr-4.7.5-1.el5_4.x86_64 Sep 24 12:13:49 Updated: openssl-0.9.8e-12.el5.i686 Sep 24 12:13:49 Installed: libXrender-0.9.1-3.1.i386 Sep 24 12:13:49 Installed: freetype-2.2.1-21.el5_3.i386 Sep 24 12:13:51 Installed: fontconfig-2.4.1-7.el5.i386 Sep 24 12:13:52 Updated: mysql-5.0.77-3.el5.i386 Sep 24 12:13:52 Installed: libjpeg-6b-37.i386 Sep 24 12:13:52 Installed: 2:libpng-1.2.10-7.1.el5_3.2.i386 Sep 24 12:13:52 Updated: openssh-4.3p2-36.el5.x86_64 Sep 24 12:13:52 Updated: gnutls-1.4.1-3.el5_3.5.x86_64 Sep 24 12:13:52 Installed: keyutils-1.2-1.el5.x86_64 Sep 24 12:13:52 Installed: cairo-1.2.4-5.el5.i386 Sep 24 12:13:52 Installed: libtiff-3.8.2-7.el5_3.4.i386 Sep 24 12:13:53 Installed: atk-1.12.2-1.fc6.i386 Sep 24 12:13:53 Installed: libXfixes-4.0.1-2.1.i386 Sep 24 12:13:53 Updated: lftp-3.7.11-4.el5.x86_64 Sep 24 12:13:53 Installed: trousers-0.3.1-4.el5.x86_64 Sep 24 12:13:53 Updated: ecryptfs-utils-75-5.el5.x86_64 Sep 24 12:13:53 Installed: libXcursor-1.1.7-1.1.i386 Sep 24 12:13:53 Installed: libXft-2.1.10-1.1.i386 Sep 24 12:13:53 Installed: pango-1.14.9-5.el5.centos.i386 Sep 24 12:13:53 Installed: libXrandr-1.1.1-3.1.i386 Sep 24 12:13:54 Updated: nspr-4.7.5-1.el5_4.i386 Sep 24 12:13:54 Installed: libXinerama-1.0.1-2.1.i386 Sep 24 12:13:54 Installed: gnutls-1.4.1-3.el5_3.5.i386 Sep 24 12:13:54 Updated: openssh-clients-4.3p2-36.el5.x86_64 Sep 24 12:13:54 Updated: openssh-server-4.3p2-36.el5.x86_64 Sep 24 12:13:55 Updated: mysql-server-5.0.77-3.el5.x86_64 Sep 24 12:13:56 Updated: 1:nfs-utils-1.0.9-42.el5.x86_64 Sep 24 12:13:56 Updated: dnsmasq-2.45-1.1.el5_3.x86_64 Sep 24 12:13:57 Updated: openssl-devel-0.9.8e-12.el5.x86_64 Sep 24 12:13:57 Updated: mysql-devel-5.0.77-3.el5.x86_64 Sep 24 12:13:57 Updated: mysql-devel-5.0.77-3.el5.i386 Sep 24 12:14:04 Installed: kernel-2.6.18-164.el5.x86_64 Sep 24 12:14:04 Updated: kernel-headers-2.6.18-164.el5.x86_64 Sep 24 12:14:04 Installed: 1:cups-libs-1.3.7-8.el5_3.6.i386 Sep 24 12:14:05 Installed: gtk2-2.10.4-20.el5.i386 Sep 24 12:14:05 Installed: trousers-0.3.1-4.el5.i386 Sep 24 12:14:05 Updated: ecryptfs-utils-75-5.el5.i386

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Re: [CentOS] Asterisk and VOIP was Re: CentOS for non-tech user
by Les Bell 01 Oct '09

01 Oct '09

Chan Chung Hang Christopher <christopher.chan(a)bradbury.edu.hk> wrote: >> Ah, well, if you want to keep the landlines, then yeah, I guess asterisk is the way to go. If your goal is to replace keyline systems, then asterisk definitely has that kind of support which, it appears, even Cisco's solution does not (from the mouth of Datacraft Asia personnel selling the school Cisco's voip solution). << I replaced our PBX with an Asterisk box and Snom VoIP phones for just this reason. All calls are made over POTS lines, although I did have it working over IAX2 with FreeWorldDialup back when they offered a free service. The functionality is significantly better than the old PBX, with a menu system to connect callers to the right extension during business hours, conferencing, voicemail with forwarding by email, etc. I have an OpenVPN connection from my desktop machine at the university where I work back to my home office LAN and can use a softphone to answer my home phone while at the office, etc. Quite neat. I've even programmed it to fetch the area weather forecast and read it out when you dial one extension. This has been much more useful than I expected - when I get sales calls from people I really don't want to deal with, I just say, "Please hold the line - I'm going to transfer you to the right person" and then transfer the call to the weather forecast. The sales person now gets what sounds like Stephen Hawking reading them the weather. Easily the best use for Asterisk ever. My setup is running on Centos 4.8 and has been a breeze to maintain. Nothing is exposed to the outside world, so I haven't felt pressured to apply updates, etc. However, I did do a little experimenting and found that it's remarkably easy to record calls using Cain+Abel to conduct an ARP cache poisoning attack between any phone and the Asterisk server. The only defences against this are to implement SRTP (Secure Real-Time Protocol), but last time I looked, this required SIP over TCP, which Asterisk did not support (not to mention having to set up a PKI and issue certs to the phones), or the much simpler control of ensuring that all phones are on a separate VLAN from the computers. For any reasonable-sized setup this isn't too hard to achieve as you may well want to buy a PoE switch to power the phones (wall warts are a PITA). There's also an excellent publication on VoIP in the NIST 800-series Special Publications, which is worth looking at. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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ignore please.
by Brian McKerr 01 Oct '09

01 Oct '09

testing email delivery

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SATA cards?
by ML 01 Oct '09

01 Oct '09

Hi All, I have a server that is IDE drives and I dont have any so I wanted to put in a sata PCI card. Will CentOS be able to see the drives as they will be connected to the card? -ML

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Discuss October 2009