Re: Managing an Internet outage


Managing an Internet outage
\ Mike Diggins (11 May 2008)
. \ Dawn Connelly (11 May 2008)
. . \ Damien Hull (11 May 2008)
. \ Mike Diggins (11 May 2008)
. \ Mark Andrews (11 May 2008)
. \ Damien Hull (12 May 2008)
. . \ Dawn Connelly (12 May 2008)
. . . \ Damien Hull (12 May 2008)
. . . . \ Dawn Connelly (12 May 2008)
. . . \ Mike Diggins (12 May 2008)
. . . . \ Pedro Espinoza (12 May 2008)
. \ Robert Spangler (12 May 2008)
. \ Rob Szarka (12 May 2008)

2 msg	WPAD / PAC woes
5 msg	dnssec-keygen: a key with algorithm 'HMAC-MD5' ...
4 msg	Resolution Check
3 msg	BIND can't resolve with unreachable second NS
10 msg	special features
2 msg	Modifying BIND to provide requesting IP address...
3 msg	Setting up my MX's records to redirect mail fro...
9 msg	Multiple SOA records?
6 msg	Bind and OpenLDAP
3 msg	bind dlz : using only Mysql
8 msg	Suggestions for coping with this issue
7 msg	Questions about Bind and AD dns integration
14 msg	Overriding MX records to internal gateways
3 msg	Bind + DKIM (ran out of space)
2 msg	time set to UTC
1 msg	Split horizon with forwarding
8 msg	Are failures cached?
2 msg	catch-all
2 msg	Problems Configuring Bind on Windows Server 2003

Subject:	Re: Managing an Internet outage
Group:	Bind-users
From:	Pedro Espinoza
Date:	12 May 2008

Reduce TTL to 5 mins or so, the way Akamai does. Then have some
rudimentary heart beat mechanism; whenever the node goes down, update
the A or CNAME record.

> >>> We occasionally have a situation where our Internet access is completely
> >>> down. My Manager has asked about the viability of locating a DNS server
> >>> off site, and during a situation when we're down, modifying it so that
> >> it
> >>> resolves my entire domain to a single IP address. Web users would be
> >>> redirected to that address, and a web page would explain we're off line.
> >>>
> >>> Our DNS TTL is set to 1 hour, however, I'm concerned that sites might
> >>> cache that address for longer than the TTL, and affect things such as
> >> mail
> >>> delivery beyond the outage. Does anyone have an opinion on this plan?
> >>> Obviously improving our redundancy is a better solution, and that will
> >>> come in time. Right now this seems like a quick and easy (dirty)
> >> solution.
> >>>
> >>> -Mike
> >>>
>
>