I have a setup that works like that (or close). lb.somesite.com A 8x.1x.1x.1 lb.somesite.com A 8x.1x.1x.2 *.somesite.com CNAME lb.somesite.com. somesite.com MX lb.somesite.com.
The lower TTL you set the more often the client will have to lookup the DNS and get a new IP. Some ISP's require that you use a mail-relay, if that is the case then you can't loadbalance on SMTP, neither incomming or outgoing. best regards Ulrik Sean Cavanaugh sagde: > I'm not saying that it wouldn't work wonders for him. I was just stating that > he doesn't HAVE to have it to fix his problem. As for your MX record issue, I would recommend setting both IPs to the same DNS name either with CNAMES or straight A record. then there would only need to be one MX record (mail.somesite.com) and when > the server goes to resolve the IP address of mail.somesite.com, it would get > round robin response between the 2 separate IPs you have. you could then put the individual mail servers as lower priority MX records (set to the same level. so like: > > > Record FQDN Record Type Record Value > MX Pref mail.somesite.net CNAME > mailserver-1.somesite.commail.somesite.net CNAME mailserver-2.somesite.com somesite.com MX mail.somesite.com. 10somesite.com MX > mailserver-1.somesite.com 20somesite.com MX > mailserver-2.somesite.com 20 > > > doing this, it would get a round robin MX record every time you queried it. > If it resolved to an IP that was down at the time, it would roll over to trying the mail servers directly which it would end up hitting the remaining live server. > > -Sean > > > From: [EMAIL PROTECTED]: Wed, 6 Dec 2006 11:08:54 -0500To: > [EMAIL PROTECTED]: Re: [pfSense Support] pfsense load balancing question > > On Dec 5, 2006, at 2:08 PM, Sean Cavanaugh wrote: > um...WOW...thats severe overkill for what he needs. It also costs money. DNS roundrobin is all he needs to use and thats free hopefully if he has a good managed > DNS service for his domain. > I disagree. We use DNS load balancing for incoming SMTP and a surprisingly > larger percentage of the mail goes to the "first" MX host in the DNS record. If you want effective and even balancing of your incoming lines, you need something more sophisticated that understands the availability, bandwidth, and utilization of each > route. > > _________________________________________________________________ Express > yourself with gadgets on Windows Live Spaces > http://discoverspaces.live.com?source=hmtag1&loc=us - If the world didn't SUCK, we'd all fall off! --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
