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From: Christophe Lohr on 31 Dec 2009 06:05
Hi,
how may I configure my system in order to ignore the RECORD ROUTE IP
option?
Note that I don't want to drop packets, I just want not to honor such a
request. E.g. how to be transparent to 'ping -R' while routing packets.

Many thanks.
From: Chris Cox on 2 Jan 2010 23:37
Christophe Lohr wrote:
> Hi,
> how may I configure my system in order to ignore the RECORD ROUTE IP
> option?
> Note that I don't want to drop packets, I just want not to honor such a
> request. E.g. how to be transparent to 'ping -R' while routing packets.
>
> Many thanks.

Are you wanting to know what options for your routing daemon (if you are
acting as a router)? Or are you somehow wanting to prevent a client
machine from doing a ping -R??
From: Christophe Lohr on 3 Jan 2010 11:40
Chris Cox a �crit :

> Are you wanting to know what options for your routing daemon (if you are
> acting as a router)?

I'm acting as a simple IP forwarder (no routing daemon, no BGP & co.
This is what you call a "routing daemon"?)

I want to know what options to activate to forward IP packets with
Record Route without recording my IP on it.


> Or are you somehow wanting to prevent a client
> machine from doing a ping -R??

I have no problem if a client machine do a ping -R to discover other
routers except me.

Regards.
From: Chris Cox on 4 Jan 2010 14:31
On Sun, 2010-01-03 at 17:40 +0100, Christophe Lohr wrote:
> Chris Cox a écrit :
>
> > Are you wanting to know what options for your routing daemon (if you are
> > acting as a router)?
>
> I'm acting as a simple IP forwarder (no routing daemon, no BGP & co.
> This is what you call a "routing daemon"?)
>
> I want to know what options to activate to forward IP packets with
> Record Route without recording my IP on it.

Record route is a piggy back option to echo afaik. I don't think
there's a kernel way to turn this off (???)... unless you want
to turn off echo altogether.


From: Christophe Lohr on 5 Jan 2010 03:59
Chris Cox a écrit :
>> I want to know what options to activate to forward IP packets with
>> Record Route without recording my IP on it.
>
> Record route is a piggy back option to echo afaik.

Record route is an IP option, not an ICMP option, so you can use record
route option even in TCP and UDP mode.

> I don't think
> there's a kernel way to turn this off (???)... unless you want
> to turn off echo altogether.


rfc791 says "The options may appear or not in datagrams. They must be
implemented by all IP modules (host and gateways). What is optional is
their transmission in any particular datagram, not their implementation."

Does that mean that I am only authorized to: (i) honor this option, (ii)
either destroy the packets?

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