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Groups > comp.os.linux.networking > #1349

Re: iptables NAT forwarding adding 75-100ms

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On 05/01/2012 02:21 AM, Pascal Hambourg wrote:
> Hello,
> 
> Mike Lovell a écrit :
>> On 2012-04-30, ein <ein@no.spam> wrote:
>>>
>>>> Ping: LAN Machine -> Debian Router = ~0.7ms
>>>> Ping: Debian Router -> Google = ~20ms
>>>> Ping: LAN Machine -> Google = ~121ms !!!
>>>
>>> Wrong!
> 
> What is wrong ?

IMHO Mike's way to attempt to diagnose the problem.

>>> Please 'ping' nearest machine after your router for example your
>>> ISP's gateway or ISP's DNS servers. Please have in mind that your ISP's
>>> router have more important things to do, than respond to ICMP echo
>>> request messages.
> 
> Indeed. So why do you suggest to ping the ISP's gateway, which is a
> router ? By the way, AFAICS, the OP did ping his own Debian router and
> a Google server, not any ISP's router.

Correlation is simple: more hops = more things can change while
connection or even while transmitting different packets to the same
machine in this connection. Each ICMP echo request message can go over
Internet with different path.

In my country small ISPs are usesd to queue everything and decide for u
what traffic is more important. ICMP "connections" are at the bottom of
list.

>> Interesting, much better:
> 
> What is much better ?

I still think the OP ISP is doing something nasty.

Mike: can u connect to your (while observing the latency problem)
router's WAN some other device for which u have access to?
It will divide the problem to smaller parts. It will answer u that the
problem is actually in forwarding at debian router.

br.

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Thread

iptables NAT forwarding adding 75-100ms Mike Lovell <mike.lovell@null.local> - 2012-04-29 17:42 -0500
  Re: iptables NAT forwarding adding 75-100ms ein <ein@no.spam> - 2012-04-30 11:06 +0200
    Re: iptables NAT forwarding adding 75-100ms ein <ein@no.spam> - 2012-04-30 11:08 +0200
    Re: iptables NAT forwarding adding 75-100ms Mike Lovell <mike.lovell@null.local> - 2012-04-30 10:11 -0500
      Re: iptables NAT forwarding adding 75-100ms Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-05-01 02:21 +0200
        Re: iptables NAT forwarding adding 75-100ms Mike Lovell <mike.lovell@null.local> - 2012-04-30 19:46 -0500
          Re: iptables NAT forwarding adding 75-100ms Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-05-01 03:01 +0200
            Re: iptables NAT forwarding adding 75-100ms Mike Lovell <mike.lovell@null.local> - 2012-04-30 20:09 -0500
              Re: iptables NAT forwarding adding 75-100ms Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-05-01 03:55 +0200
                Re: iptables NAT forwarding adding 75-100ms Mike Lovell <mike.lovell@null.local> - 2012-04-30 21:07 -0500
                Re: iptables NAT forwarding adding 75-100ms Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-05-01 10:46 +0200
              Re: iptables NAT forwarding adding 75-100ms Ralph Spitzner <rasp@spitzner.org> - 2012-05-04 09:30 +0200
        Re: iptables NAT forwarding adding 75-100ms Ian Zimmerman <itz@buug.org> - 2012-05-01 12:35 -0700
          Re: iptables NAT forwarding adding 75-100ms Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-05-02 00:06 +0200
        Re: iptables NAT forwarding adding 75-100ms ein <ein@no.spam> - 2012-05-02 07:43 +0200
        Re: iptables NAT forwarding adding 75-100ms Ralph Spitzner <rasp@spitzner.org> - 2012-05-04 09:22 +0200
  Re: iptables NAT forwarding adding 75-100ms Chris Davies <chris-usenet@roaima.co.uk> - 2012-04-30 10:34 +0100
    Re: iptables NAT forwarding adding 75-100ms Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-30 11:15 +0100
      Re: iptables NAT forwarding adding 75-100ms Chris Davies <chris-usenet@roaima.co.uk> - 2012-04-30 23:59 +0100
    Re: iptables NAT forwarding adding 75-100ms Rick Jones <rick.jones2@hp.com> - 2012-04-30 18:33 +0000
      Re: iptables NAT forwarding adding 75-100ms ein <ein@no.spam> - 2012-05-02 07:51 +0200
        Re: iptables NAT forwarding adding 75-100ms Rick Jones <rick.jones2@hp.com> - 2012-05-02 19:07 +0000
  Re: iptables NAT forwarding adding 75-100ms Alastair Black <abqab.nemo@example.net> - 2012-04-30 06:40 -0600
    Re: iptables NAT forwarding adding 75-100ms Mike Lovell <mike.lovell@null.local> - 2012-04-30 10:12 -0500
  Re: iptables NAT forwarding adding 75-100ms Wolfram Gloger <wmglo@dent.med.uni-muenchen.de> - 2012-05-09 14:05 +0200

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