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Old 25th May 2010
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
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"proto" refers to protocols within IPv4 or IPv6, such as ICMP, ESP, or TCP. A fairly complete list are found in /etc/protocols.

If your rule does not have an explicit family, it refers to both IPv4 and IPv6. If it has one, it is limited to that family.
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