Friday, October 28, 2011

Computer mysteries

I do not know why the domain upvnet.upv.es was not solved during the class but as soon as I got back to my office it worked as shown below:



$ nslookup -type=MX upvnet.upv.es
Server: 158.42.249.8
Address: 158.42.249.8#53


upvnet.upv.es mail exchanger = 10 albali.cc.upv.es.
upvnet.upv.es mail exchanger = 20 mxv.cc.upv.es.
upvnet.upv.es mail exchanger = 30 mx2.cc.upv.es.
upvnet.upv.es mail exchanger = 50 vega.cc.upv.es.
upvnet.upv.es mail exchanger = 10 mx4.cc.upv.es.

You can see there are five different servers to be used with the precedence indicated by the numbers, the lower  the number the more is preferred.

Please read sections 3.1 to 3.3 before next lecture.
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1 comment:

  1. Josele11/11/2011 12:32 AM

    I have doubts about the checksum of UDP and what does connectionless mean in the context of UDP. Also I am interested in the port scanner that is mentioned in the book and why is not accepted in UPV's servers.

    PS: Do not try to change partitions while using Hiren's boot CD or grub rescue will harm you for some time.

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