I really need to do someting like that on my wrt54gs:

iptables -t mangle -A PREROUTING -i vlan1 -j TTL --ttl-inc 1
iptables -t mangle -A PREROUTING -o vlan1 -j TTL --ttl-inc 1

How to add TTL target support ?

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Arv.

Is it at least on TODO list ?

The ttl support is provided as a module for iptables. By installing iptables-extra, you will be able to use this iptables feature.

Package : http://openwrt.org/downloads/experiment … mipsel.ipk

Not really.

There is ipt_ttl.o module which allows to filter on ttl values.
What I need is ipt_TTL.o which enables TTL target (-j TTL).
Support for TTL target requires some patches from path-o-matic. I did it on PC few times however I'm worrying not to brick my wrt54gs ;-(. So I appreciate help.

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Arv.

I looked in the package, there is the module you mention : ipt_TTL.so. I think you should update your buildroot or look in the following package : http://openwrt.org/downloads/experiment … mipsel.ipk

The current experimental doesn't apply POM automatically.

The file in iptables-extra_1.3.1-1_mipsel.ipk is libipt_TTL.so, which is a user space module.  He still needs the kernel module ipt_TTL.o in addition to that.

(Last edited by mtakahar on 2 May 2005, 04:44)

Would anyone with experience build it ?

Install : http://openwrt.org/downloads/experiment … mipsel.ipk
Then : http://openwrt.org/downloads/experiment … mipsel.ipk

And you should be able to use the TTL features

No, it doesn't work.

iptables: No chain/target/match by that name

There's no TTL target, and of course there is no ipt_TTL.o

I appreciate any help, but it seems to me You didn't even check that.

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Arv.

If you like to try unofficial pre-release stuff, have a look at my GCC 3.4 build at http://openwrt.inf.fh-brs.de/~nbd/gcc34/
It should include a TTL module in kmod-iptables-extra, iptables-extra (please do not try to install kernel modules from that repository on your official experimental build, it may lead to unexpected kernel behavior).

Thanks a lot. I'll try it. (and I hope I won't brick my router)

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Arv.

Are you load kernel module before use of "iptables (...) -j TTL (...)"?
insmod ipt_TOS.o
or sth like this...

the TTL patch is included in the latest official patch-o-matic ng pack. I'll try to test it as soon as possible

No need to. We had it in CVS for a while now. If you want to test it, you can just grab my build at http://openwrt.inf.fh-brs.de/~nbd/gcc34/ (it's in kmod-iptables-extra, iptables-extra)

it is possible to change TTL on WAN side on Motorola WR850G ?