[GRLUG] !Linux-periodic dns failure

[Bill Littlejohn]

We use Charter Business as our primary ISP, and an internal forwarding
DNS server that forwards to DynDNS for external domains.
A couple times a week we're having failure of DNS for about 10 minutes
at a time, so I wrote a script to check the Charter gateway, internal
DNS, DynDNS, OpenDNS, and Charter DNS.
During the last failure (ending 10:02am today) I ran the script and
all external DNS queries timed out except for Charter's DNS.
That would seem to indicate that Charter is somehow dropping or
interfering with those external DNS queries.
Anyone know how I might verify that?

I called Charter support... they offered to send someone to test our
modem. <sigh>

Any help or pointer in the right direction would be appreciated.
Thanks.
-Bill

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