[cs615asa] CS615 hw4

[Pengfei Liu]

 Hi,

 This is from my caching dns server
 16:44:16.055984 IP ip-10-85-62-208.ec2.internal.32768 >
ip-172-16-0-23.ec2.internal.domain: 19485+ A? www.yahoo.com. (31)
 16:44:16.057759 IP ip-10-85-62-208.ec2.internal.32769 >
ip-172-16-0-23.ec2.internal.domain: 32394+ PTR? 23.0.16.172.in-addr.arpa.
(42)
 my dns server  ip-10-85-62-208 requires server on
ip-172-16-0-23.ec2.internal.domain .

 16:44:16.058665 IP ip-172-16-0-23.ec2.internal.domain >
ip-10-85-62-208.ec2.internal.32769: 32394 1/13/0 (294)
 ip-172-16-0-23.ec2.internal.domain respondes my dns server

 16:44:16.058786 IP ip-10-85-62-208.ec2.internal.32769 >
ip-172-16-0-23.ec2.internal.domain: 21242+ PTR? 208.62.85.10.in-addr.arpa.
(43)
16:44:16.164588 IP ip-172-16-0-23.ec2.internal.domain >
ip-10-85-62-208.ec2.internal.32768: 19485 4/13/0 CNAME[|domain]
16:44:16.165012 IP ip-10-85-62-208.ec2.internal.36096 >
ir1.fp.vip.re1.yahoo.com.www: Flags [S], seq 4096862439, win 5840, options
[mss 1460,sackOK,TS val 268897 ecr 0,nop,wscale 7], length 0

 16:44:16.166815 IP ir1.fp.vip.re1.yahoo.com.www >
ip-10-85-62-208.ec2.internal.36096: Flags [S.], seq 3217848389, ack
4096862440, win 5792, options [mss 1440,sackOK,TS val 3293627061 ecr
268897,nop,wscale 8], length 0

 ir1.fp.vip.re1.yahoo.com respondes my dns server.

 including the query from your DNS server to the root server.
 It queried from my dns server to ec2 internal domain. It didn't show the
query from ec2 internal domain to the root server. Is this right?

 Thank you!

 On Sat 09/04/11 10:37 AM , Jan Schaumann jschauma at cs.stevens.edu sent:
 Pengfei Liu  wrote:

 > "the DNS query from your DNS server to one of the root servers"
 >
 > I encountered this "sudo: unable to resolve host ip-10-114-214-158? if
 > I change
 > "domain ec2.internal
 > search ec2.internal
 > nameserver 172.16.0.23" to "nameserver 192.203.230.10" in resolv.conf
 > file. (ip-10-114-214-158 is the server's ip and 192.203.230.10 is e
root
 > server)

 I don't think you have understood the objective of this part of the
 assignment.

 You are not expected to directly query the root server yourself. You
 are to set up one host as a caching DNS resolver and then point a second
 host to use this server as its DNS server. After that, you are to use
 tcpdump to track the various quries, including the query from your DNS
 server to the root server.

 -Jan

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