Networking delay & timeout

Networking delay & timeout

[Miro Dietiker, MD Systems]

Hi!

I'm having some trouble with "general networking", using simple Ethernet
Gigabit interfaces on a routing computer (routing in between eth0,
eth1).

My network has 10 Servers and a public internet gateway. Router does arp
proxying.
If I "ping" from a Internet-computer (unrecently used before to connect
to that server), my firewall produces Initial delays around 1000ms!

C:\>ping abcde
Ping frankonia [X.X.X.X] mit 32 Bytes Daten:
Antwort von X.X.X.X: Bytes=32 Zeit=441ms TTL=53
Antwort von X.X.X.X: Bytes=32 Zeit=33ms TTL=53
Antwort von X.X.X.X: Bytes=32 Zeit=32ms TTL=53
Antwort von X.X.X.X: Bytes=32 Zeit=32ms TTL=53

If i ping later on, delay remains that low.

In some certain cases, the target even is temporarily unreachable...

Is there anyone who can tell me how to debug the source of this delay?
Is it possible to reduce it?
The initial delay seems to be sourced by the linux router, while the
temporary unavailability seems to be sourced by the target server,
temporarily not answering to packets!

Do you have any suggestion for analternative list to post this question?

+-------------------------------+  +-------------------------------+
| Miro Dietiker                 |  | MD Systems Miro Dietiker      |
+-------------------------------+  +-------------------------------+

Re: Networking delay & timeout

[Norbert van Nobelen]

I have a few questions:
- Did you do any relevant upgrades at all at any of the involved machines?
- Did you do a ping from a second machine from the same location, or better 
another machine from another location
- traceroute for problems in between?



On Thursday 01 December 2005 12:27, you wrote:
> Hi!
>
> I'm having some trouble with "general networking", using simple Ethernet
> Gigabit interfaces on a routing computer (routing in between eth0,
> eth1).
>
> My network has 10 Servers and a public internet gateway. Router does arp
> proxying.
> If I "ping" from a Internet-computer (unrecently used before to connect
> to that server), my firewall produces Initial delays around 1000ms!
>
> C:\>ping abcde
> Ping frankonia [X.X.X.X] mit 32 Bytes Daten:
> Antwort von X.X.X.X: Bytes=32 Zeit=441ms TTL=53
> Antwort von X.X.X.X: Bytes=32 Zeit=33ms TTL=53
> Antwort von X.X.X.X: Bytes=32 Zeit=32ms TTL=53
> Antwort von X.X.X.X: Bytes=32 Zeit=32ms TTL=53
>
> If i ping later on, delay remains that low.
>
> In some certain cases, the target even is temporarily unreachable...
>
> Is there anyone who can tell me how to debug the source of this delay?
> Is it possible to reduce it?
> The initial delay seems to be sourced by the linux router, while the
> temporary unavailability seems to be sourced by the target server,
> temporarily not answering to packets!
>
> Do you have any suggestion for analternative list to post this question?
>
> +-------------------------------+  +-------------------------------+
>
> | Miro Dietiker                 |  | MD Systems Miro Dietiker      |
>
> +-------------------------------+  +-------------------------------+
>
>
> -
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