Re: linux/apache based website performance
From: David Efflandt (efflandt_at_xnet.com)
Date: 07/08/04
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Date: Thu, 8 Jul 2004 02:25:45 +0000 (UTC)
On 5 Jul 2004 20:56:18 -0700, Wenjie <gokkog@yahoo.com> wrote:
> Hello,
>
>
> Recently we met problems to access a website hosted on
> redhat 8.0 with apache server 1.3. Some of us cannot post
> bigger than one page data to the website from within
> a corporation LAN network. While displaying seems fine
> to almost all of us. For example I did a ping:
>
> C:\>ping www.dayspot.com
>
> Pinging dayspot.com [222.64.22.24] with 32 bytes of data:
>
> Ping statistics for 222.64.22.24:
> Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
> Approximate round trip times in milli-seconds:
> Minimum = 0ms, Maximum = 0ms, Average = 0ms
Many systems have ping disabled to minimize DoS attacks. For example you
could not ping my adsl connection even if you did know its public IP or
*.no-ip.com name.
How is the apache server connected to the internet, directly on public IP,
or indirectly on LAN behind a broadband router? Especially with ping
disabled (and possibly all icmp), there may be an mtu path discovery
problem, particularly if it is using PPPoE (which has 1492 max mtu).
I ran across that problem when attempting to send mail with attachments to
an smtp server on LAN at home (port 25 forwarded through adsl router). It
kept doing "timeout during data transfer" until I set the LAN nic of smtp
server to mtu 1492.
Max mtu can be determined from the server using ping -M do -s data_bytes
to some internet host, where max successful data_bytes + 28 = max mtu.
-- David Efflandt - All spam ignored http://www.de-srv.com/
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