Subject: [ipcdn] RE: Outstanding issue with docsDevFilterIpSourcePortLow and similar MIB objects

From: "Matthew Schmitt" <[email-masked]>
Date: Mon, 6 Dec 2004 10:32:21 -0700

Perhaps it'd be simpler to just say that it only applies when the packet is TCP/UDP?  That's essentially the way that it was worded in the RFI specification.
 
Matt

	-----Original Message-----
	From: [email-masked] [mailto:[email-masked]] 
	Sent: Monday, December 06, 2004 10:21 AM
	To: DOCSIS OSS Majordomo List
	Cc: [email-masked]
	Subject: Outstanding issue with docsDevFilterIpSourcePortLow and similar MIB objects

	Hi,
	 
	We have noticed a discrepancy between the implementation of docsDevFilterIpSourcePortLow between different modems. The difference probably comes from that fact that what makes sense and what the specification says are different. The spec says:
	 
	docsDevFilterIpSourcePortLow :
	    If docsDevFilterIpProtocol is udp or tcp, this is the
	    inclusive lower bound of the transport-layer source port
	    range that is to be matched, otherwise it is ignored
	    during matching.
	 
	However, docsDevFilterIpProtocol can also be set to any (256), which is not listed above. This means that compliant CMs, should ignore docsDevFilterIpSourcePortLow when the Protocol is set to any. However, this does not seem to make much sense, as such interpretation makes the "any" value pretty much useless.
	 
	Long time ago, this issue was brought up on the IPCDN reflector by other people. However, it seems it has never been resolved.
	 
	I would like to propose an ECR to section 7.3.5 of the OSSI spec to clarify that docsDevFilterIpSourcePortLow and similar MIBs are also applicable when docsDevFilterIpProtocol is set to any (256) and the IP packet is either tcp or udp.
	 
	Would there be an objection to this?
	 
	Thanks,
	André

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