iptables stop/start vs restart ...

iptables stop/start vs restart ...

[Chicken of the Apocalypse]

Hi All,
 
Simple problem, although I'm sure it's been raised before and I need to search harder!
 
I've got a basic setup/configuration of iptables-1.2.11-3.1 running on 2.6.10-1.766_FC3smp with one change in the /etc/sysconfig/iptables-config file. I increase the hashsize using:
/sbin/modprobe ip_conntrack hashsize=32767.
 
If I run service iptables stop/start and then cat /proc/sys/net/ipv4/netfilter/ip_conntrack_buckets the value is 32767. If I run service iptables restart the value in the file goes back to default. I've noticed the same in a power failure scenario where the machine lost power and on reboot didn't change the hashsize.
I've had a quick look through /etc/init.d/tideway and as far as I can tell a restart just runs a stop and start. I'm assuming some sort of save/restore flag is or isn't set and this is causing the problem during a restart or power cut.
 
I need to ensure that the correct hashsize is always set. Any have any ideas?
 
Thanks

Re: iptables stop/start vs restart ...

[John A. Sullivan III]

On Thu, 2005-09-29 at 10:50 +0100, Chicken of the Apocalypse wrote:
> Hi All,
>  
> Simple problem, although I'm sure it's been raised before and I need to search harder!
>  
> I've got a basic setup/configuration of iptables-1.2.11-3.1 running on 2.6.10-1.766_FC3smp with one change in the /etc/sysconfig/iptables-config file. I increase the hashsize using:
> /sbin/modprobe ip_conntrack hashsize=32767.
>  
> If I run service iptables stop/start and then cat /proc/sys/net/ipv4/netfilter/ip_conntrack_buckets the value is 32767. If I run service iptables restart the value in the file goes back to default. I've noticed the same in a power failure scenario where the machine lost power and on reboot didn't change the hashsize.
> I've had a quick look through /etc/init.d/tideway and as far as I can tell a restart just runs a stop and start. I'm assuming some sort of save/restore flag is or isn't set and this is causing the problem during a restart or power cut.
>  
> I need to ensure that the correct hashsize is always set. Any have any ideas?
>  
> Thanks
Can you use the options parameter in modprobe.conf rather than
specifying the option on the command line? - John
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@opensourcedevel.com

If you would like to participate in the development of an open source
enterprise class network security management system, please visit
http://iscs.sourceforge.net

Re: iptables stop/start vs restart ...

[Chicken of the Apocalypse]

Hi John,

> Can you use the options parameter in modprobe.conf
> rather than specifying the option on the command 
> line? - John

I can, not sure of what the format would be?

Thanks

Re: iptables stop/start vs restart ...

[John A. Sullivan III]

On Thu, 2005-09-29 at 11:48 +0100, Chicken of the Apocalypse wrote:
> Hi John,
> 
> > Can you use the options parameter in modprobe.conf
> > rather than specifying the option on the command 
> > line? - John
> 
> I can, not sure of what the format would be?
> 
> Thanks
> 
I'm not entirely sure since I don't do it myself but you can check man
modprobe.conf.  It is probably something like:

options ip_conntrack hashsize=32767
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@opensourcedevel.com

If you would like to participate in the development of an open source
enterprise class network security management system, please visit
http://iscs.sourceforge.net

Re: iptables stop/start vs restart ...

[Chicken of the Apocalypse]

Thanks both for the replies.

--- "John A. Sullivan III"
<jsullivan@opensourcedevel.com> wrote:
> I'm not entirely sure since I don't do it myself but
> you can check man modprobe.conf.  It is probably 
> something like:
> 
> options ip_conntrack hashsize=32767

I checked the man page and your command was right.
I've tested it and works perfectly.

Thanks again!




> -- 
> John A. Sullivan III
> Open Source Development Corporation
> +1 207-985-7880
> jsullivan@opensourcedevel.com
> 
> If you would like to participate in the development
> of an open source
> enterprise class network security management system,
> please visit
> http://iscs.sourceforge.net
> 
> 

Re: iptables stop/start vs restart ...

[Sai Kiran]

hi,

> /sbin/modprobe ip_conntrack hashsize=32767.


>/proc/sys/net/ipv4/netfilter/ip_conntrack_buckets the value is 32767.
If I run service iptables

try putting the following line into /etc/sysctl.conf


net.ipv4.netfilter.ip_conntrack_buckets = 32767

and try adding the following cmd to iptables script in /etc/rc.d/init.d

/sbin/sysctl -p


hope this would update the values.


regards,
kiran