Howto confirm DNS is not the problem?

[Michael Galea]

> -----Original Message-----
> From: teddymills [mailto:teddymills-VFlxZYho3OA at public.gmane.org]
> Sent: Tuesday, September 16, 2003 2:58 PM
> To: tlug-lxSQFCZeNF4 at public.gmane.org
> Subject: [TLUG]: Howto confirm DNS is not the problem?
> 
> 
> Howto confirm DNS is not the problem?
> I can use ping to test TCPIP networks, but how can I confirm DNS?
> 
> Start using dig and nslookup?
> Or tcpdump port 53? (can i view the packets in a meaningful way?)
> 
> 
> 
> Problem:
> ======
> Just surfing around, I can goto websites and most of them work.
> However a great deal of them do not show..Sometimes 
> refreshing the browser
> works and it pulls up the page.
> Also email...same thing..Usually it works, often I cannot 
> connect. I retry
> and it works usually.
> Once a FTP or HTTP download starts, its very reliable and fast.

Are you on cable or DSL? I am on DSL with eol.ca and had some 
mildy erratic behaviour until I dropped the MTU to 900 bytes.  
I also noticed that my dsl line restarted frequently, (sometimes 
30-40 times a day).

I asked eol.ca about the MTU and the restarting.  They said they
would ask bell to check the line and, lo and behold, a few days
later the line became nice and stable.
They had no idea about the cause of the MTU problem though..

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