1
I can access all the websites except a few websites- particularly that of my own college!
When I did nslookup www.iitm.ac.in I got the IP, but when I ping that particular IP, I get nothing.
What can be the problem here? How can I resolve this issue? ALso I ran "traceroute www.iitm.ac.in" and got the following:
Amardeep Mishra
Posted 2017-08-18T04:43:11.647
Reputation: 11
3
I can't also ping from here :) But I can access the web site using a browser.
That means that site is ignoring ping requests, which is usually done for security reasons (see the answers from here: https://security.stackexchange.com/questions/4440/security-risk-of-ping).
For example, in linux ping can be disabled like this:
# echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all
jp48
Posted 2017-08-18T04:43:11.647
Reputation: 131
The problem is not just "pinging". The main problem is-- I cant access the website itself! Also everyone here can access the same website but me! I guess the problem lies with my ubuntu. – None – 2017-08-18T05:11:16.367
You can fake an HTTP request with curl -s -I https://www.iitm.ac.in/. Do you get a 200 OK code in the first line? If so, maybe try with another browser? Another possibility could be a wrong proxy (?) – jp48 – 2017-08-18T05:23:17.327
No I did not get anything! It returned me the next prompt thats all! Also I tried accessing the website from chrome(I am currently using mozilla) but it showed- This site cant be reached, www.iitm.ac.in took too long to respond – None – 2017-08-18T05:25:35.913
In that case I feel it can't help you with that, I am sorry. – jp48 – 2017-08-18T05:39:44.920
0
You will have to set the correct DNS server, usually a one offered by your university. I have seen this happen before.
If you're using Google DNS, some web-sites of your university may not accessible, but once you set the DNS to the one offered by your university, they will be.
shivams
Posted 2017-08-18T04:43:11.647
Reputation: 1 269
I can access that website. Suggest you edit your question to include a traderoute - "tracert www.iitm.ac.in" under windows, "traceroute www.iitm.ac.in" under Linux – Tim – 2017-08-18T05:43:36.353
I ran that command i.e traceroute www.iitm.ac.in but i got gateway in first row and then some ip in second row followed by *** in all subsequent rows – Amardeep Mishra – 2017-08-18T06:18:29.360
1I think the only answer here is to report the problem to your Internet Service Provider – Tim – 2017-08-18T07:06:08.803
Likely nothing to do with Ubuntu per se since I can access it with mine. What does
wget http://iitmwww.iitm.ac.insays? What doesroutesays (when you cannot access it)? – xenoid – 2017-08-18T21:01:22.077