Hey all. I’ve been wrestling with something and I’d like to get some thoughts on it. I was getting reports from users of the network being slow. In my troubleshooting, I noticed that my MRs (MR56) were showing that clients were intermittently not getting DNS responses. Finding a dns perf tool, I verified very high DNS latency or just no responses to queries. I have two different ISPs connected to two separate MS125s acting as break out switches that go into a pair of MX450s in HA. When I switched to my other ISP, I again got a large number of no responses to DNS. I also did pings to various sites and servers but did not observe any loss or latency. After moving my perf tool from AP to then switch, to then MX and then to the break out switches, the DNS issue seemed consistent at each level. That is until I plugged the ISP directly into the MX, not going through the breakout switch. So it seems like removing the breakout switch may be the issue… The breakout MS is not showing low memory usage and does not seem to be under extreme stress. Anyone have any experience with this or have any additional thoughts?
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