DNS Servers not responding

[Alphacore]

Clients who have these dns servers also cannot reach our webhosting nameservers, however every other internet provider can reach them no problem.

Cannot ping the following DNS servers

Primary DNS

61.9.242.33

Secondary DNS

61.9.242.1

Our company runs a major hosting operation and this has left all of the sites who are being visited from telstra connections with these specific DNS entries unable to reach websites.

An example site if anybody wishes to replicate

embmal.com.au

Resolves correctly on mxtoolbox with no dns issues and also resolves on all other providers other than telstra with the above dns.

[Alphacore]

And it was working for a few days and it is now down again,

Same name servers not responding from a certain cluster of telstra clients.

Multiple clients not able to ping both DNS addresses

Primary DNS

61.9.242.33

Secondary DNS

61.9.242.1

Fix your DNS servers!!

[WWP]

There seems to be a general problem with Telstra's routing for the last week or more.  I had one client who's websites were invisible to Telstra internet users for 4 days last week.  All their other customers could see the website and Telstra mobile users could see it.  I have another client who's website disappeared for Telstra customers on Friday and it is still down even though everyone else can see it.

Interestingly, I am on iPrimus and use the Google DNS (8.8.8.8) but the network is owned by Telstra.  I can see the sites in question but I can't ping them or perform a successful traceroute.  These functions aparently don't use the DNS.

Pinging the router gets 3 timeout messages and performing a tracerout results in the route timing out after hitting a server in Singapore (IP: 174.133.118.131)

Unfortunately the Telstra support staff don't even know what a traceroute is and refuse to accept any problem exists so they wont escalate the tickets.

[Kenobi]

Hi, 

This could be an issue with the website's Time-To-Live (TTL) settings. Telstra can only go off what you set for your domain. If you have made changes during that timeframe our servers will not update their records until such time as the previous TTL expires.

[calafradulistic]

Waht lame answer. I have every dns lookoup either timing out or lagging for up to 1 minute these days. We now have options Telstra. Going to Optus now that the NBN has arrived.