When you ran the ping tests, did you try all sizes from 56-1500 with no fragment flag set? I've seen a case where 2 random sizes didn't pass which resulted in some very bizarre behavior. ;-)
-Hal On Thu, Oct 30, 2014 at 8:58 PM, Bill Prince via Af <[email protected]> wrote: > > This is a bizarre set of symptoms, and I really don't know what is going > on. So I will articulate the facts, and maybe one of you can tell me what > might be wrong. > > We have a business subscriber that occupies several buildings. The > buildings are separated by enough distance that we have to interconnect by > means other than vanilla ethernet. > > Our service is delivered to their main office. Our SM is installed there > (PMP450), plus a Mikrotik router on ROS 5.26. The Mikrotik manages 4 > VLANs; 1 business VLAN, which is bridged to the main subnet in the main > office. The other 3 VLANs are guest VLANs; each on their own (private) > subnet. > > All the computers, etc. work fine in the main office. > > The main office is connected to the "guest building" with a VDSL modem (~~ > 800' phone line between buildings). Not much occurs in the guest building; > it has a couple of WiFi APs for the guests. > > In the guest building, we've installed an RB260GS switch. It divides the > various ports out to 4 different VLANs. A couple ports are the "business > VLAN", plus 3 different "guest VLANs". The SFP port on the RB260GS is used > to connect to the "satellite office" another couple hundred yards beyond > the guest building. The SFP port is on the business VLAN. > > At the satellite office, they have 2 computers. Everything on the 2 > computers in the satellite office seems to work just fine. Web browsing, > streaming youtube, etc. > > However, when they run Outlook, "some" email doesn't go to the > destination. As far as we can tell, it gets to their off-site SMTP server > (Globat), but some of it doesn't ever reach its destination. If they use > their web-based email, the email works every time. Also, the POP part of > the email works just like you'd expect. > > Today, we moved one of the computers back to the main office, and > surprise, surprise, Outlook starts working just like it's supposed to. > > We've run extended ping tests between the satellite office and the main > office, and there is no break in the link. It seems solid. So where/how > is the SMTP part of email breaking? > > What tests can I run to figure this out? > > > -- > bp > > -- Harold Bledsoe
