[smokeping-users] Re: Re[2]: logging multiple connections

[Peter Mees]

   Thanks , without the -net parameter did the trick.

    route add 1.1.1.1/32 gw 10.1.1.A


Alvast bedankt,
Peter Mees                          


mailto:peter at cts.be
CTS bvba 
Molsesteenweg 83
2490  BALEN



>---Original Message---

>From:    hkclark at yahoo.com <hkclark at yahoo.com>
>To:      smokeping-users at list.ee.ethz.ch <smokeping-users at list.ee.ethz.ch>
>Date:    Saturday, January 15, 2005, 2:18:09 PM
>Subject: [smokeping-users] Re: Re[2]: logging multiple connections
>Files:   <none>

> Hi Peter,

> Thank you for the clarification.

> You should be able to get what you want if you add the
> appropriate "host route" to "hack" the routing table
> on your smokeping unix box (a “host route” is a route
> where the netmask is 32 bits long [255.255.255.255 or
> /32 depending on how you want to represent it].  For
> example, say you represent the next-hop routers to
> each ISP connection as A (Telenet) and B (Skynet) and
> that the IPs for these 2 devices are 10.1.1.A and
> 10.2.2.B.  Then say you have your default gateway on
> your smokeping server set to use 10.2.2.B.  That
> should result in a 0.0.0.0/0 route in the server with
> a next hop of 10.2.2.B; meaning that *all* traffic off
> the local subnet goes through 10.2.2.B (assuming there
> are no other routes on the box).  What you want to do
> is override this default route, but *just* for one of
> the outside servers you want to monitor.  Let's say
> these outside servers are server-1 and server-2 with
> the IP addresses 1.1.1.1 and 2.2.2.2 respectively. 
> Without a host route, both servers will follow the
> default route and ping through Skynet via the 10.2.2.B
> router.  But, if we add a host route to the
> destination 1.1.1.1/32 and specify a next hop of
> 10.1.1.A, then only traffic to the exact IP address
> 1.1.1.1 will go through Telenet.  The Linux command
> should be something like: 
>   route add -net 1.1.1.1/32 gw 10.1.1.A

> Does that sound like what you are looking for?

> Regards,
> Kennedy

> PS – I should point out that I’m more of a network guy
> than a huge Unix admin type of person.  For this to
> work, I’m assuming that your Unix/Linux box does what
> is called “longest match routing” (or “longest prefix
> routing”).  Things like Cisco routers have done this
> by default for years now (the “Router Requirements
> RFC” has mandated this since something like 1995), and
> I would think all modern Unix-like OSs would be the
> same.  However, I could be wrong. :-)

> --- Peter Mees <peter at cts.be> wrote:

>>    I will try to be more specific.
>> 
>>    In my local network there's one machine that is
>> the smokeping machine.
>>    It has 2 nic's in it , one is connected to isp 1
>> (Telenet), the other to my
>>    lan switch. On that lan switch , there is a
>> connection with another
>>    small router that is connected to isp 2 (Skynet).
>>    Skynet and Telenet are the main internetproviders
>> for Belgium.
>> 
>>    I have 2 other machines which are placed in 2
>> different datacenters
>>    to host websites.
>> 
>>    What i want to do , is use the smokeping machine
>> to verify the
>>    connection to my 2 other server on both isp
>> connections.
>>    Why ? Because isp1 (Telenet) sometimes has a
>> route problem to one
>>    of my other servers. Then clients starting to
>> call me because
>>    theirs websites arent accesible from within the
>> Telenet network.
>> 
>>    So if i can use smokeping for this purpose ,
>> clients can check
>>    themself if it is a connection problem with
>> Telenet.
>> 
>> 
>>    


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