Re: Checking for internet connection.
| From: | Andy Shellam | Date: | Mon, 21 Dec 2009 19:40:08 +0000 |
| Subject: | Re: Checking for internet connection. | ||
| References: | 1 2 3 4 5 6 7 8 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-300627@lists.php.net to get a copy of this message | ||
>
> Both at home and at work there are caching DNS on the LAN. So a DNS
> request may come back with a valid IP address when the WAN connection is
> down. I still won't be able to connect to the remote site.
Dig an external server - e.g. dig @a.root-servers.net google.co.uk
If your net is down the query will fail even if the reply is cached locally, because you're
specifically requesting a response from a.root-servers.net.