<qoute RFC 1122> 2.3.2 Address Resolution Protocol -- ARP
2.3.2.1 ARP Cache Validation
An implementation of the Address Resolution Protocol (ARP) [LINK:2] MUST provide a mechanism to flush out-of-date cache entries. If this mechanism involves a timeout, it SHOULD be possible to configure the timeout value.
...
[LINK:2] "An Ethernet Address Resolution Protocol," D. Plummer, RFC-826, November 1982.
</quote>
Please read carefully what you have quoted: It says: *An* implementation... and then goes on with a citation of RFC 826. A simple citation does not make a valid standard yet. It just refers to it as an example for this specific issue. That's all.
-- Roman
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