Hi there,
when tracing several hosts (no matter if using ICMP or UDP etc.) the software shows me heavy packet loss on my gateway (linksys router with openwrt) although this cannot be verified otherwise.
When I do a ping to the router using the command prompt (with ping plotter running in parallel) it pongs alright.
Isn't it able to identify the many pongs that traverse the NAT (or is the NAT broken) or what could this be?

Hi.

We have a linksys here running open wrt - same exact results. A single target works OK, but multiple targets start to drop packets at hop 1. We just ignore hop 1.

This happens because the router / firmware is either having issues keeping track of TTL=0 replies on that hop, or possibly because a deliberate choice by router's software. As open source software, it may be interesting to look at the handling code and see what's up. We've not done that yet, though.

For now, you pretty much just have to ignore hop 1's packet loss and look at hop 2.

Best wishes,
Pete