Discuss September 2010

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225 participants
168 discussions

Routing of outgoing packets
by Mitja Mihelič 22 Nov '10

22 Nov '10

Hi! I am trying to use hping to chek the latency of our network. Somehow things are not going to plan and I thought someone might be able to shed some light on the subject. Here is the setup: (the IP addresses gvien here are fake, but they do represent the correct state of the networking setup) vlan interface IP mask V2 eth0 192.168.20.20 32 V4 eth1 172.16.4.40 32 V6 eth2 172.16.6.60 32 The default route is set to eth1. The idea is to use eth2 for pinging only, the other two interfaces are used by another service and management access. If I do: ping -c 2 -I eth2 74.125.39.147 or fping -c 2 -I eth2 74.125.39.147 It binds to eth2 and sends its ICMP probes via that interface with the IP on that interface. If I do: hping3 -1 -c 2 -I eth2 74.125.39.147 -VD or [root@server ~]# hping3 -c 2 -I eth2 74.125.39.147 -VD DEBUG: if lo: Don't Match (but seems to be UP) DEBUG: if eth0: Don't Match (but seems to be UP) DEBUG: if eth1: Don't Match (but seems to be UP) DEBUG: if eth2: OK using eth2, addr: 172.16.6.60, MTU: 1500 It supposedly binds to eth2. But tcpdump tells another story. Packets get sent out via the default route (eth1) with the IP from eth2 set as the source address. The same happens with tcptraceroute (tcptraceroute-1.5-0.beta7.el5.rf.i386.rpm). I have tried various routing policies, but I have yet to find a solution that works. I have used iptables to log the packets in the OUTPUT chain, but they arrive there with the interface already set to eth1. Can anyone help ? Regards, Mitja Mihelic

3 3

RHEL 6 potential release date???
by Tom Bishop 10 Nov '10

10 Nov '10

Benn playing with the beta's and have looked around for a potential release date...Does anyone know what the likely date is??? Thanks....

11 16

selinux with samba
by Geert Batsleer 29 Oct '10

29 Oct '10

I'm having problems setting up a samba server with sellinux in centos 5.6 (x64). My samba config works flawlessly when selinux is disabled but fails to access shares when selinux is enabled. Wich command makes it possible to run samba with selinux without disabling it, now I've done: "set sebool -P smbd_disable_trans 1" but doesn't really solve my problem. Thanks in advance! geert

3 2

necessary/unused rpm packages
by Alice Anderson 28 Oct '10

28 Oct '10

Is there a way to identify if an rpm package is unused, or how much it is used? I would like to reduce my load time by removing unused packages in my kickstart, but do not want to cause problems for users on active systems by guessing which ones are not necessary (I load everything with kickstart now). If I could find the packages are not used I could start by excluding them from a load and be fairly certain my users would not be impacted.

5 4

drbd update 8.3.8.1
by Shad L. Lords 22 Oct '10

22 Oct '10

Can we get a refresh of the drbd packages to 8.3.8.1 There was a fix to the resync protocol. 8.3.8 would stall under certain circumstances. Thanks, -Shad

4 5

FreeNx doesn't work?
by gaohu 13 Oct '10

13 Oct '10

I have installed freenx with this article http://wiki.centos.org/HowTos/FreeNX but when I use freenx-client on windows to connect to server, I always get an "freenx Authentication failed." client err log output as this: NX> 203 NXSSH running with pid: 1584 NX> 285 Enabling check on switch command NX> 285 Enabling skip of SSH config files NX> 285 Setting the preferred NX options NX> 200 Connected to address: 192.168.253.5 on port: 22 NX> 202 Authenticating user: nx NX> 208 Using auth method: publickey NX> 204 Authentication failed. My sshd configed as use rsa key, and ssh soft like xshell can work well. nxsetup output as this: Pleas care the following red commented two line. I just think this is the point. But why , and what shoud I do to solver ? [root@tigertall ~]# nxsetup --test ----> Testing your nxserver configuration ... Warning: Could not find nxdesktop in /usr/bin. RDP sessions won't work. Warning: Could not find nxviewer in /usr/bin. VNC sessions won't work. Warning: Invalid value "APPLICATION_LIBRARY_PRELOAD=/usr/lib/libX11.so.6.2:/usr/lib/libXext.so.6.4:/usr/lib/libXcomp.so.2:/usr/lib/libXcompext.so:/usr/lib/libXrender.so.1.2". /usr/lib/libX11.so.6.2 could not be found. Users will not be able to run a single application in non-rootless mode. Warning: Invalid value "DEFAULT_X_SESSION=/etc/X11/xdm/Xsession" Users might not be able to request a default X session. Warning: Invalid value "COMMAND_START_CDE=cdwm" Users will not be able to request a CDE session. Warning: Invalid value "COMMAND_SMBMOUNT=smbmount". You'll not be able to use SAMBA. Warning: Invalid value "COMMAND_SMBUMOUNT=smbumount". You'll not be able to use SAMBA. Error: Could not find 1.5.0 or 2.[01].0 or 3.[01].0 version string in nxagent. NX 1.5.0 or 2.[01].0 or 3.[012].0 backend is needed for this version of FreeNX. Warnings occured during config check. To enable these features please correct the configuration file. <---- done ----> Testing your nxserver connection ... Permission denied (publickey,gssapi-with-mic). Fatal error: Could not connect to NX Server. Please check your ssh setup: The following are _examples_ of what you might need to check. - Make sure "nx" is one of the AllowUsers in sshd_config. (or that the line is outcommented/not there) - Make sure "nx" is one of the AllowGroups in sshd_config. (or that the line is outcommented/not there) - Make sure your sshd allows public key authentication. - Make sure your sshd is really running on port 22. - Make sure your sshd_config AuthorizedKeysFile in sshd_config is set to authorized_keys2. (this should be a filename not a pathname+filename) - Make sure you allow ssh on localhost, this could come from some restriction of: -the tcp wrapper. Then add in /etc/hosts.allow: ALL:localhost -the iptables. add to it: $ iptables -A INPUT -i lo -j ACCEPT $ iptables -A OUTPUT -o lo -j ACCEPT [root@tigertall ~]# Thanks you! 2010-08-15 gaohu

7 9

Went with OpenDNS for now
by Ron Blizzard 11 Oct '10

11 Oct '10

A few weeks ago I asked about firewalls and family filters. Lanny Marcus, I believe, suggested OpenDNS. Just wanted to thank him (and everyone here) for their suggestions. Eventually I would like to learn about firewalls, but I don't really want to run another machine at this time. OpenDNS is trivial to set up on the router and looks to be just about exactly what I wanted. Thanks. Sorry to have dropped out of the other thread without thanking everyone or reporting the results -- I just last night dug up the thread (google search) and saw the OpenDNS suggestion. -- RonB -- Using CentOS 5.5

2 3

Zoneminder
by Joseph L. Casale 08 Oct '10

08 Oct '10

I have a few dvr's that I am contemplating converting to Zoneminder (don't know any other app) and would prefer to use CentOS over fedora obviously but the only rpm I see exists for Fedora. I don't want the hassle of manually compiling this, as we have our own config mgmt. Anyone using this rpm (srpm recompiled) in CentOS or know of a solution that exists? Thanks! jlc

6 9

HP ML110 G6: how to update kernel with HP hpahcisr raid driver installed
by Dario Lesca 01 Oct '10

01 Oct '10

Hi! I have install Centos 5.5 on HP ProLiant ML110 G6 with RAID-1 hardware active. (00:1f.2 RAID bus controller: Intel Corporation 5 Series/3400 Series Chipset SATA RAID Controller (rev 05)) I have follow this suggest: http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?la… ... start with "linux dd" and, at the end of setup, install the hpahcisr into kernel 2.6.18-194.el5PAE But after reboot if I run a "yum update" and reboot, the new kernel not contain the driver hpahcisr for new kernel and I get a kernel panic. The question is: How to update to last kernel without lost the proprietary driver? It's possible? Where is the new driver for new kernel? Many thanks. -- Dario Lesca <d.lesca(a)solinos.it>

6 6

MegaRAID Storage Manager on CentOS 5.5?
by James Pearson 01 Oct '10

01 Oct '10

Does anyone have the 'MegaRAID Storage Manager' GUI working on CentOS 5.5? I can run it, but it won't let me log in. The docs state that it requires the local root username and password - but it always rejects this with "Message = Login failed: Invalid username or password!" Thanks James Pearson

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Discuss September 2010