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Date:      Sun, 13 May 2007 16:15:08 +0100
From:      "Martin Hepworth" <maxsec@gmail.com>
To:        "Craig Russell" <crussell_1969@yahoo.com>
Cc:        freebsd <freebsd-questions@freebsd.org>
Subject:   Re: Wierd Network problem
Message-ID:  <72cf361e0705130815o32094919kc754697b9f877638@mail.gmail.com>
In-Reply-To: <20070512174104.74533.qmail@web51601.mail.re2.yahoo.com>
References:  <20070512174104.74533.qmail@web51601.mail.re2.yahoo.com>

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Criag

have you tried cables? Could be a duff network cable or even speed mismatch
between you and the router/switch.

-
martin

On 5/12/07, Craig Russell <crussell_1969@yahoo.com> wrote:
>
> I have a dell poweredge 6650 installed with freebsd
> 6.1 and on the local router, everything works great
> (ie, a computer on a different subnet off the same
> router can access it fine) but coming from outside of
> the network access is incredibly slow.  My first
> thought was that it must be a routing issue, but I
> have two other freebsd 6.1 servers on that same subnet
> and I can access them fine from outside.  I dug a
> little further and compared the servers that are
> working with those that are not and these are the
> differences that I have found.
>
> On the servers that are working (dell poweredge
> 2450's) the interface is an fxp0 and here is the
> output of ifconfig:
> fxp0:
> flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu
> 1500
> options=8<VLAN_MTU>
> inet6 fe80::2b0:d0ff:fee1:f66a%fxp0 prefixlen 64
> scopeid 0x1
> inet 64.25.218.2 netmask 0xffffff80 broadcast
> 64.25.218.127
> ether 00:b0:d0:e1:f6:6a
> media: Ethernet autoselect (100baseTX <full-duplex>)
>         status: active
>
> on the server that is not working:
>
> bge0:
> flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu
> 1500
> options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
> inet6 fe80::211:43ff:fedc:9aa2%bge0 prefixlen 64
> scopeid 0x1
> inet 64.25.218.10 netmask 0xffffff80 broadcast
> 64.25.218.127
> ether 00:11:43:dc:9a:a2
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
>
> The first thing that i noticed is that on the option
> line there is quite a bit of difference between the
> two.  So using the command line ifconfig tool I
> removed RXCSUM, TXCSUM from the bge0 interface.
> Voila!  Speed increased and the server was actually
> accessible from off net.  Unfortunately, as soon as I
> tried to access any other port, the interface crashes.
> Eventually the watchdog picks up on that and restarts
> the interface.  But the problem is completely
> repeatable.
>
> The server that I am having problems with is running
> cpanel 10.9; the two that are working are running the
> dns-only version of cpanel.  I am not picking up any
> errors in the logs.  This could be related to cpanel,
> or not, I'm not really sure, although it shouldn't be.
>
> The other unique thing about the setup, that very well
> may be affecting is that the router in question has
> two subnets configured on the internal port.  There is
> a nat'd subnet for our local users and there is the
> public subnet that these servers sit on.  The final
> resting place for all three is in a datacenter that
> isn't built yet, so rather than reconfigure everything
> once that was done I simply routed the final subnet to
> our office and set it up their.  The router is a
> mikrotik RB112 board which only has one ethernet port
> so I couldn't dedicate a port for the new subnet.  As
> I said, my first thought was that the problem was in
> the router, but the other two servers are running
> fine.
>
> Any suggestions?
>
> Thank you,
> Craig Russell
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