Differences between current version and predecessor to the previous major change of URG.

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Newer page: version 4 Last edited on Monday, March 8, 2004 4:25:54 am by StuartYeates
Older page: version 2 Last edited on Sunday, March 7, 2004 4:42:25 pm by CraigBox Revert
@@ -1,5 +1,6 @@
 A flag set in a [TCP] header to define that the packet contains __URG__ent data. 
-QualityOfService mechanisms can then be used to ensure that this packet is routed along quicker links, not dropped in a congested network , etc
+Contrary to popular belief this is not used in QualityOfService, but is used to tell a TCP reciever that there is urgent data further along the stream so they may wish to drop all data until it's recieved (for instance). Very few protocols use this feature , telnet(1) being basically the only one I am aware of
-However, it's much like the "Priority: High" flag in MicrosoftOutlook, if everyone sets it, it gets devalued.