How to know that it is down time?

kareem_nasser

I want to know how like if the requests time out or there is no reply or DNS error.

Kareem

kareem_nasser wroteI want to know how like if the requests time out or there is no reply or DNS error.

If I get you correctly, if you try to ping a host not an IP and you get back the reply as IP then there must be no DSN error. You can also use ping -a

C:\Users\KARIM>ping -a 74.125.79.99

Pinging ey-in-f99.1e100.net [74.125.79.99] with 32 bytes of data:
Reply from 74.125.79.99: bytes=32 time=135ms TTL=51
Reply from 74.125.79.99: bytes=32 time=141ms TTL=51
Reply from 74.125.79.99: bytes=32 time=134ms TTL=51
Reply from 74.125.79.99: bytes=32 time=136ms TTL=51

Is that what you are looking for ?

kareem_nasser

I just wanted to know about Down Time from ISPs how can i detect them.

babum

like comparing between a blocked site and a down site? if thats the question then you would need to try using proxies.

julien_saadeh

It's when you fail to open websites. As simple.

There is no way to know whether other ISPs (than you are connected to) are down or not.

battikh

I THINK he wants to know when his ISP is down (as opposed to the website he is trying to reach is down), to know if the problem is from his ISP or from somewhere else.

1 thing you can do is ping an IP address instead of the domain name to eliminate the DNS problem. Try pinging something that will always be up, like google (66.102.13.147 or their dns server, 8.8.8.8, easy to remember) or something.

Then if you get drops, to know if the problem is from your ISP, google or anyone in between, do a traceroute and see where your packets are being dropped.

kareem_nasser

Yeah why didnt i think of that thnx.