Great Circle Associates Firewalls
(August 1994)
 

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Subject: Re: mount from Internet
From: Brent Chapman <brent @ mycroft . GreatCircle . COM>
Date: Thu, 04 Aug 1994 10:02:37 -0700
To: gaus @ znanost . mz . hr (Damir Rajnovic)
Cc: firewalls @ greatcircle . com
In-reply-to: Your message of Thu, 4 Aug 94 12:50:26 +0100

gaus @
 znanost .
 mz .
 hr (Damir Rajnovic) writes:

# Hello,
# 
# Well, here is another little question of mine and please do not laugh or
# et least do not laugh aloud.
# 
# If I understod correctly following lines will disable all mount attempts
# form any host on outside network and enable all other kind of packet:
# 
#    acces-list 101 deny 0.0.0.0 255.255.255.255 X.X.X.0 0.0.0.255 eq 2049
#    acces-list 101 permit 0.0.0.0 255.255.255.255 X.X.X.0 0.0.0.255
# 
# Am I right? I have Cisco IGS.

No, sorry.  NFS is an RPC-based service.  RPC-based services, by their
nature, might end up on any random UDP port.  NFS seems to
consistently get 2049, at least on SunOS 4.x machines; this may be due
to NFS's special status in relationship to the kernel.  I wouldn't
want to _count_ on _all_ NFS servers _always_ getting port 2049,
however; there's nothing about the way NFS works (that I know of,
anyway) that says that has to be true.


-Brent
--
Brent Chapman         | Great Circle Associates  | Call or email for info about
Brent @
 GreatCircle .
 COM | 1057 West Dana Street    | upcoming Internet Security 
+1 415 962 0841       | Mountain View, CA  94041 | Firewalls Tutorial dates


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