should use firewall when peering?

[bgp4cn <bgp4cn () sina com>]

Hi,everyone,

yesterday  our parner tell me that almost all carriers in North America  implementing firewalls when they interlink 
with another carriers.
I do not think so.But he came from one of US's carriers,and who insist on that opinion and suggest our new-building 
carrier network to use
firewalls between Chinanet and Internet.
who came from Sprint/MCI/UUNET or other ISP's,can you tell me what really the things?
And our parner also said we can use private IP on our carrier's networks,who said that we use NAT on the internet 
access router(runing BGP,and have our
own public AS),I think NAT is too low performance to use at the inter-ISP link router,and have problems of multi-ISPs 
interlink's torlance,and 
have problems with some applications which go to another ISP,do you think so?
Bye the way, I came from China,any suggestion will be appreciated.



Regards,
miao laisheng
miaols () bridge net cn
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