ping and ICMP

[min zhang]

I was trying to ping www.mit.edu, but it seems the IP address for MIT changed from time to time. 

at first I got reply from  104.97.199.24, but then the reply was from 23.210.251.185. 

So it is basically can show any class A IP address ?  as per my understanding, the PING should gave me the public IP address of mit.edu, which should be a constant IP.

 

Could anyone explain why is this happen ? 

Thanks ~

[Riddhima Singh]

bacause of load balancing and round robin DNS, a single host name has multiple ip addresses assigned

thstwhy you get diff ip wen doing ping

pls correct me if this isnt correct!

[Frank (sjsu) Lin]

that's certainly possible... how about use trace route to analyze the whole path?

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[min zhang]

thanks for the reply ~~

the trace route is also different for different IP.

so the IP address depends on which server provides the service .

but I have a new question.

when tracert mit.edu, I cannot visit mit webpage using the ip address(23.203.59.35) I got from tracert.

but when I tracert sjsu.edu, I can actually get sjsu homepage when I type the IP (130.65.3.221) to my browser .

Why is that happen?

what is the different between the ip addresses I got from tracert mit.edu and tracert sjsu.edu?

Should they both be a temp IP ?

[Frank (sjsu) Lin]

interesting question.  I don't know the definitive answer.  My hunch is that DNS RR record (remember that thing?) may be organized differently such that ping and web have different ip.