On Sat, Jan 22, 2000 at 01:24:20AM -0500, Bennett Samowich wrote:
> I am curious about the properties of firewall, software or hardware. In
> particular:
> 1) Do all firewalls have Input, Output, and Forward rules as a default?
> 2) Do all/most firewalls only support TCP/IP, UDP, and ICMP?
> I am only familiar with ipfwadm and ipchains on Linux and am curious if the
> design concepts carry through to other devices and software.
Its a IP packet filter. It has usually input and sometime forwarding and
output rules. It is optimized for IP Protocols. Note that this is not
neccesaryly the case, for example the new Linux netfilter system will have
additional rules for accepting and sending locally generated packets.
A firewall is most of the time more than a simple packet filter. It will
include proxies or filters for application protocols (mail, web, ...). It
will include alerting and authentication and it may also include some non-ip
support (appeltalk, ipx, decnet, etc).
Greetings
Bernd
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