Hi all,
We're stumped. We've got a new 1gig metro E circuit, our ISP is peering on all the local IXP's and we get good throughput to local servers. They have a diversified upstream network which includes HE and Cogent. However, we are unable to exceed 5% of the links capacity when reaching international servers, specifically on Windows PC's. The ISP has been doing some investigation but nothing has turned up. My suspicion is that it's MTU or TCP windowing related, but all testing checks out. We have a Sophos UTM as our gateway which never exceeds 10% CPU or link utilization. Any ideas how we can fault find this further?
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