I have an issue with a particular client that is running a Cisco 871 Router. It does the NAT as well as IDS functions. The problem has been happening is that Mac users cannot get upload speeds faster than about 3.0kb/s to most FTP sites. I can connect and upload just fine with a PC. The Macs can download at normal speed from the same sites, but, not upload. It seems to occur on about half of the FTP sites that they use. I have ruled out the machines as the problem, the ISP says it isn't doing any filtering. The only thing I can think of would be something with the router configuration. I have attached the important parts of the config. If anyone could give me some suggestions I would greatly appreciate it.