From: Matthew Reath [mailto:matt () mattreath com]
Sent: 07 February 2012 21:34
To: nanog () nanog org
Subject: Firewalls in service provider environments
Looking for some recommendations on firewall placement in service
environments. I'm of the school of thought that in my SP network I do
little firewalling/packet filtering as possible. As in none,
I had a vendor actually suggest that that ALL my customer traffic should
traverse a firewall. I asked why and they said "Ahhh it the internet, must
have firewall". I suppose this must have been a great firewall.
So yes I would agree with you, firewall nothing for your customers unless
they are paying you for a specific service. Filtering known bad ports,
well, what's a known bad port? Bad for one person may be quite important
for another. Whilst filtering port 25 outbound may help prevent some bots
from emanating spam, it certainly does a lot to annoy other people.
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