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34753 discussions

IPv6 forwarding and ip6tables
by Robert Moskowitz 30 Dec '08

30 Dec '08

I am running multiple IPv6 subnets here in my testbed. My IPv6 'router' is a Centos box with IPv6forwarding turned on. It is also my RADVD server (over multiple VLans), and Miredo server/relay. I thought I had a simple ip6table setup that protected the box and let it forward. Well I am wrong. I got my previous DNS over IPv6 working on the DNS server, then tried to get it working from another box. After a couple hours fighting with it, I finally figured out that my Centos IPv6 router was rejecting the IPv6DNS queries, not forwarding them. I turned off ip6tables and the DNS lookups worked just fine. So I thought, well Shorewall6 beta is out, let's go with it already. I check out the shorewall discussions and discover you need at least the 2.6.25 kernel for Shorewall6. When I mentioned my dilemma, I was told that "2.6.18 doesn't support stateful IPv6 firewalling at all!" Just great...... When is that Centos 6 going to happen???? :( Anyway, the challenge for now: What do I put into ip6tables so that any IPv6 traffic that comes in any of the vlans on eth1 can go out any of the vlans on eth1?

1 0

DNS resolver over IPv6
by Robert Moskowitz 30 Dec '08

30 Dec '08

I have a Centos server that is running BIND and has IPv6 global addresses. I have entered a number of AAAA records into this copy of BIND in a local view and zone (tld is htt). Over IPv4, I have no trouble with nslookup ('nslookup - 127.0.0.1' and 'nslookup - 192.168.128.55'). I get the AAAA records back. But if I try to use the IPv6 address of the system I get a time out. Both from nslookup and from ping6. I setup /etc/resolv.conf as shown at: http://docsun.cites.uiuc.edu/sun_docs/C/solaris_9/SUNWaadm/SYSADV5/p13.html (the only hit I got on configuring resolv.conf for an IPv6 DNS server). I have turned off both ip6tables and iptables so it is not a firewall issue. Even 'nslookup - <ipv6 addr>' does not work. I seem to recall a problem with nslookup supporting udp over IPv6, but ping6 should not have that problem. This is all on the single system running BIND. I figure i got to get that working before worrying about other systems!

4 7

cluster - ip address lost when service stopped
by Fabio Macchi 30 Dec '08

30 Dec '08

Hi all, I'm trying to setup a cluster of 2 machines with Centos 5.2 to host a postfix+spamassassin+clamav+mailscanner service. Below cluster software versions rgmanager.i386 2.0.38-2.el5_2.1 installed cman.i386 2.0.84-2.el5_2.2 installed Every machine (hp blade server ) has 4 interfaces, bounded in this way: Eth0, eth1 -> bond0 -> connection for public service ( 10.0.181.x ) Eth2,eth3 -> bond1 -> connection for intra-cluster communication ( 192.168.44.x ) bond0 Link encap:Ethernet HWaddr 00:21:5A:48:DA:BE inet addr:10.0.181.41 Bcast:10.0.181.255 Mask:255.255.255.0 inet6 addr: fe80::221:5aff:fe48:dabe/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:85 errors:0 dropped:0 overruns:0 frame:0 TX packets:86 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:12963 (12.6 KiB) TX bytes:9144 (8.9 KiB) bond1 Link encap:Ethernet HWaddr 00:1F:29:6D:7D:08 inet addr:192.168.44.41 Bcast:192.168.44.255 Mask:255.255.255.0 inet6 addr: fe80::21f:29ff:fe6d:7d08/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:29 errors:0 dropped:0 overruns:0 frame:0 TX packets:223 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4612 (4.5 KiB) TX bytes:31746 (31.0 KiB) Then I've created a new Mail service with these local resources: - Ip address 10.0.181.3 - Script /etc/rc.d/init.d/MailScanner - GFS file system on a SAN Service start, but the problem is that, when I stop the service, external ip address is removed from bond0. What may cause this ? I don't find any helpful information in /var/log/messages, what may I check to investigate ? I've not setted any fence device, as I have configured GFS resource internally to the service ( GFS partition is mounted only from the server running the service ): is this a wrong design ? Has anyone already setup this kind of service on a Centos cluster ? Many thanks in advance for any hints. Fabio

3 6

2 internet connections and one for backup
by Mariusz 30 Dec '08

30 Dec '08

I've got 2 internet connections but unfortunately not the same - 6mbit and 1 mbit. My default is 6mbit and I want to create backup connection (1mbit). How can do it? Has anybody done it? My perfect scenario is that my network uses 1mbit if (only) 6mbit fails and it switches automatically. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

11 17

2 default gateway?
by Mario 30 Dec '08

30 Dec '08

I've got 2 internet connection, one is direct connected to my server and the second i use by default gateway. How can I create 2 default gateway? I want to add default gateway my second internet. How can I solve problem which gateway is used? Mario

6 7

Source for kernel.
by clemens＠dwf.com 29 Dec '08

29 Dec '08

Im brand new to CentOS, so this is probably a question with a simple answer (if I only knew where to look). Someone hans pointed me at the centos.plus kernel, which is close to what I need, but I still have to add a couple of options. So where do I find either the src for the centos.plus kernel, or a diff from something like 2.8.18 or 2.6.28.8 ??? With this Ill be able to add my additional options... -- Reg.Clemens reg(a)dwf.com

3 2

yum cannot find bittorent rpm at dag
by James B. Byrne 29 Dec '08

29 Dec '08

I am trying to get the x86_64 isos of CentOS-5.2. I wish to use bittorrent. The last time that I did this I required the bittorent package from Dag's repository. I have configured /etc/yum.repos.d/DagWieers.repo thus: [dag] name=Dag Wieers RPM Repository for Red Hat Enterprise Linux #Also see URL http://dag.wieers.com/home-made/apt/ baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag gpgcheck=1 # This repo often does not respond in a timely fashion so turned off # by default. Use yum --enablerepo=dag to use. enabled=0 gpgkey=http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt includepkgs=bittorrent* perl* # priority requires yum-priorities. Must also be enabled in /etc/yum.conf # and /etc/yum/pluginconf.d/priorities.conf. priority=20 Then I run yum thus: # yum --enablerepo=dag whatprovides bittorent But yum cannot find bittorrent. Loading "fastestmirror" plugin Loading mirror speeds from cached hostfile * epel: mirror.unl.edu * dag: apt.sw.be * base: centos.mirror.iweb.ca * updates: centos.mirror.iweb.ca * addons: centos.mirror.iweb.ca * extras: centos.mirror.iweb.ca dag 100% |=========================| 1.1 kB 00:00 Reducing Extra Packages for Enterprise Linux 5 - x86_64 to included packages only Finished Reducing Dag Wieers RPM Repository for Red Hat Enterprise Linux to included packages only Finished No Matches found What am I doing wrong? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

4 9

Source for Kernel
by clemens＠dwf.com 29 Dec '08

29 Dec '08

OK, perhaps I wasnt clear in my previous posting. I am looking for either a SRPM for the CentOS 5.2 centos.plus kernel, or more likely, a diff from the kernel at kernel.org. I was pointed to the wiki, which MENTIONED a Source RPM, but didnt point to anywhere to find these for CentOS. All Ive been able to find are ISO's . I really dont need a bunch of tools that will complicate the problem, a simple diff is what Im looking for,- its got to be out there somewhere. -- Reg.Clemens reg(a)dwf.com

4 3

dkim-milter-2.7.2 and Centos 5.2
by Gregory P. Ennis 29 Dec '08

29 Dec '08

I am trying to install dkim-milter-2.7.2 on a Centos 5.2 system and keep getting the following errors. I have very little experience in C programing so I am at a loss as how to proceed. I have sendmail-devel installed Here is the tail of the result output of sh ./Build make[2]: cc: Command not found make[2]: *** [assert.o] Error 127 make[2]: Leaving directory `/etc/mail/dkim/dkim-milter-2.7.2/obj.Linux.2.6.18-92.1.22.el5xen.i686/libsm' make[1]: *** [/etc/mail/dkim/dkim-milter-2.7.2/obj.Linux.2.6.18-92.1.22.el5xen.i686/libsm/libsm.a] Error 2 make[1]: Leaving directory `/etc/mail/dkim/dkim-milter-2.7.2/obj.Linux.2.6.18-92.1.22.el5xen.i686/dkim-filter' make: *** [all] Error 2 Any ideas? Greg Ennis

2 3

UDEV rule allow users to unmount USB stick
by Philip Manuel 29 Dec '08

29 Dec '08

I'm trying to understand why a normal user is not allowed to unmount their USB stick? I think it is most likely a udev rule. does anyone know ? Thanks Phil.

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