> The 4 network cards are all on the same network which are public addresses. The infrastructure was that way when I arrived. I am now behind a firewall, a recent addition (PFSense), but the basic issue predates the firewall.
OK, if you are 100% sure. I would have targeted the firewall, since this issue is experienced by external users.
> I have made a decision to use a single IP address on the server, I can see no need for multiple addressses.
Or you can physically remove three NICs and assign their IP addresses too to the remaining one.
> believe that having 4 IP addresses on one machine all on the same LAN segment is a bad practice.
Unless all of them point to the same NIC!
> Also, I don't think that the load from my system would ever tax a single Gig network card.
Even then, can four NICs deliver more through the same switch. Can your machine saturate a singe Gbit connection?
> we have several domains that have entries using the same IP adddresses. For example I have a zone for school1.edu which moodle-web.school1.edu, has 4 A records that point to the same 4 ip addresses as the zone for school2.edu moodle-web.school2.edu. Each of the zones has a cname record that points moodle.schoolx.edu to moodle-web.schoolx.edu. In fact there are 4 zones in my DNS set up like that and people can come in to the website from any of them. Once they get to the site and login, they all seem to be using the same name from the primay zone that moodle itself is associated with. It doesn't seem to make any difference which "domainname" the user comes in under.
That made me suspicious. Did you know that config.php in $moodle has a variable called
$CFG->wwwroot which points to the URL of the site, like 'http://moodle.school.domain'. What is the value of your site?
> In changing my DNS, I think I will just have each of the zones that are not the primary zone have a single cname record that points to the primary zone's A record for the site. For instance I will have a CNAME record moodle.school2.edu that points to moodle-web.schoolx.edu where schoolx.edu is my primary entry and the one that Moodle itself is setup with.
The experiment above could be done without touching DNS.
> I took a quick look at Munin over the weekend and installed it on a test server just to see what it worked like.
The number of users you mention is ridiculously low for a SUN server. There is something terribly wrong.
Hardware and performance
Intermitant Performance Issue
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