OT: Router

Alex Neuman van der Hans alex at nkpanama.com
Fri Mar 16 21:43:03 CET 2007

To all netiquette nazis, sorry for top posting... :-)

Keyword here is ADSL.

Lower the MTU across the board. I could bet everything starts to work, 
as if by magic. In every place you can set it, set it to somewhere 
between 1400 and 1460 bytes.

For Windows you can use drtcp (dslreports.com/drtcp). The appliances can 
probably be set using their config pages.

Paul Welsh wrote:
> Sorry this is OT but I'm sure I'll get some sensible answers here.
> I've been playing with the Sophos SC1000 appliance that scans web pages for
> nasties before end users get to see them.  This web content scanning malarky
> is going to be "a big thing" I'm sure.
> Anyhow, for my sins I'm running MS ISA Server 2004.  Stuck the Sophos
> appliance on its own DMZ and pointed its default gateway at the Internet via
> an el cheapo Netgear router configured to do NAT which is connected in turn
> to a high speed ADSL line via an el cheapo BT ADSL router operating in
> non-NAT mode.
> All works fine except certain web sites, eg, Natwest online banking.  The
> https page where you enter your customer ID loads.  You enter your ID and it
> hangs before reaching the page where you enter random characters of your PIN
> and password.  Likewise, some web mail sites (non-secure) hang at certain
> points.  I think the web mail site is hanging when it tries to run a .pl
> page.
> After a lot of head scratching it turned out to have nothing to do with the
> appliance.  A different PC connected to the router exhibited the same
> problems.  Gave the appliance a public IP and stuck it on the Internet and
> it works fine.   This configuration is, I understand, not officially
> supported though.
> Time to buy a better router?  Any recommendations?  The router isn't
> configured to do anything odd and I have rebooted it.
> I intend placing 2 servers running MailScanner on the same DMZ at a later
> date.  Is it sensible therefore to buy a decent router/firewall to protect
> this segment?  Smoothwall / monowall worth a go?

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