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How to setup both Transpaent Proxy and firewall on the same Machine.
by Indunil Jayasooriya 14 Jun '07

14 Jun '07

Hi ALL, I want to setup Transpaent Proxy on the box running iptables Firewall. With iptables, I have given below rules. iptables -F INPUT iptables -F OUTPUT iptables -F FORWARD iptables -F -t nat iptables -F -t mangle #Enabling ip forwarding echo "1" > /proc/sys/net/ipv4/ip_forward #enable syn cookies (prevent against the common 'syn flood attack') echo "1" > /proc/sys/net/ipv4/tcp_syncookies #do source validation by reversed path echo "1" > /proc/sys/net/ipv4/conf/all/rp_filter #Enable tracking mechanism /sbin/modprobe -a ip_conntrack_ftp ip_nat_ftp iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT DROP iptables -A FORWARD DROP iptables -A OUTPUT DROP in addition to that, There are many rules , ALL work fine. in squid.conf file, I have added below rules, http_port 3128 cache_mem 64 MB cache_dir ufs /var/spool/squid 100 16 256 cache_access_log /var/log/squid/access.log cache_log /var/log/squid/cache.log cache_store_log /var/log/squid/store.log httpd_accel_host virtual httpd_accel_port 80 httpd_accel_with_proxy on httpd_accel_uses_host_header on And, Then, I did below command. iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128 But, When I browse Internet , request will not get ridirected to 3128 port. So I can not use squid as a Transpaent Proxy. Where have I gone wrong? I reffered to below URL. http://www.tldp.org/HOWTO/TransparentProxy.html#toc2 Pls help me. -- Thank you Indunil Jayasooriya

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Ndiswrapper for Realtek 8180L on CentOS 5.0
by Manish Kathuria 14 Jun '07

14 Jun '07

Hello, I had installed CentOS 5.0 on my desktop PC having a Realtek 8180L based PCI wireless card. Since the drivers for this chip are not available in the kernel, I created RPMs for ndiswrapper-1.43 from the source code and installed them. I could configure the wireless card and use it but invariably the system freezes after sometime. No such thing happens if the wireless card is disabled. In the past, I have been using ndiswrapper on the same system on CentOS 4.3 and 4.4 and multiple Fedora distributions without any problem. I have also updated to the latest kernel and recreated the ndiswrapper modules but the problem persists. What could be the possible reason ? Thanks, Manish

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where is xbindkeys- solved
by Jerry Geis 13 Jun '07

13 Jun '07

>I did a "yum provides xbindkeys" and it does not find the package? >Where can I find xbindkeys? >Thanks >Jerry I found it... I was expecting it to be in that big yum repository in the sky but it wasnt. binding keys works like a champ with this. Jerry

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Dual boot in CentOS 4.4
by Andrew Allen 13 Jun '07

13 Jun '07

I've recently upgraded from RedHat 9 to CentOS 4.4. With RH9 I had a dual boot system with Windows XP (RH9 as the default of course!), which was automatically set up when I installed RH9 in the remaining partition after I'd installed XP. However, I appear to have lost my dual boot with CentOS 4.4 (no option to boot into DOS now), even though I still have the Windows XP partition, so how can I (re-) set up the dual boot? Thanks, Andy

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where is xbindkeys
by Jerry Geis 13 Jun '07

13 Jun '07

I did a "yum provides xbindkeys" and it does not find the package? Where can I find xbindkeys? Thanks Jerry

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key bindings
by Jerry Geis 13 Jun '07

13 Jun '07

I am trying to bind keys on centos 5. I want to run my own APP when I hit keypad 4 and a different APP when I hit keypad 5. I was looking at xmodmap but I dont see how to execute my own command? I was looking in the gnome keyboard shortcuts but I dont see how to enter a command it only lets you change the accelerator for a given action. Not create a new action. How can I setup keypad 4 and 5 to run app1 and app2 respectively? THanks, Jerry

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freq scaling on centos 5
by Jerry Geis 13 Jun '07

13 Jun '07

In the old centos 4 we had cpuspeed and we could send a SIGUSR1 to it so the CPU would run at max speed. In centos 5 cpuspeed is not running. (although running with cpuspeed -C will go full speed) what is the correct way now in centos 5 to on the fly say run at full speed then sometime later tell it to drop back down? I have no process to signal any more. Jerry

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anyone using a webcam on centos 4 /5
by Jerry Geis 13 Jun '07

13 Jun '07

Hi all, Was wondering if anyone was using a webcam on centos 4 or 5? I was thinking about getting one but wanted to make sure it will work. Any recommendations? Thanks, Jerry

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Two Issues - Postfix and Gamin
by Brent DiNicola 13 Jun '07

13 Jun '07

Greetings, I have done a bit of searching and I have found that the 4.5 version of Postfix is the following rpm: postfix-2.2.10-1.1.el4.i386.rpm. I had previously had the CentOSPlus version with mysql compiled in and just recently upgraded to 4.5 from 4.4, upon doing this.. the above RPM was installed, which is greater than the postfix with mysql from CentOSPlus, which is the following rpm: postfix-2.2.10-1.RHEL4.2.mysql_pgsql.c4.i386.rpm (note the 2.2.10-1 version without the extra .1 from above.) I tried to manually install the postfix with mysql but of course the versioning is greater on 4.5 rpm, is there a plan to fix this or should I try to roll my own RPM with mysql included? This happened to restart during a 5am auto yum update, causing my server to bounce this morning until I found it, ooops my bad! The second issue is also with 4.5 but with Gamin. I have about 20 Linux CentOS workstations that have been running nicely for several months (almost years) and after the 4.5 upgrade I have noticed that the gam_server process with Gamin keeps sucking up all the CPU cycles after a short time of running. (Sometimes tied to screen saver use but not always). I haven't changed anything in my environment that I can see would cause this problem after the 4.5 upgrade. (Same file server for NFS mounts, same autofs entries etc). Has anyone else noticed this issue and found a work around, I did some digging but most entries on this issue are from the 2005 range which didn't fix my issue and/or were for an older version. The /etc/gamin/gaminrc didn't fix it through various mutations of entries and short of removing the gam_server from libexec, I would like to find a solution or know if anyone else has experienced this issue. Thanks Brent PS. Great work guys on the OS, I have lurked on the Mailing lists for a number of years and you are doing outstanding work and support. Great JOB! -- Brent DiNicola/Whitewolf The Whitewolf of Imrryr <centos .AT. elric.net> http://www.elric.net Disclaimer: Any opinions expressed here are from my dog. Any liabilities fall to the dog.

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ContOS5 and Samba-Vscan
by der knilch 13 Jun '07

13 Jun '07

Hi, I am running a CentOS 5 file server in our Windows network and I wanted to add a anti virus scanner. I got a clamav package from atrmps.net, but the samba module samba-vscan is missing. So I am not able to integrate clamav as an on-demand scanner. Does anyone know, where I can get the samba-vscan module? Thanks knilch

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