I'm running both Windows XP Professional and Windows Server 2003 for the following. I've been trying to understand the LCP negotiation phase for TCP/IP networks. I'm using CMAK (Connection Manager Administration Kit) to create my own connection for high latency networks. As a result I wish to modify what is being negotiated during LCP. I feel as though I've read most of the documentation regarding this subject and since I'm still a little stuck, I'm coming to YOU GUYS for some help/answers! The most explicit information regarding this topic can be found here for everyone to brush up on . Also, the log I am reading is in the directory, "C\:Windows\tracing\PPP.log" The relevant information for this topic can be found under "LCP Options" of this document. My goal here is to cut out as much option negotiation as possible. My highest priorities are at the top of the following list. I want to change the default Maximum Receive Unit (MRU) from 1,500 to 576. I believe it is essential to change this default value on both the client and server side but I don't know how to go about it. I don't want Callback for any connection. The document says that for "Microsoft Windows 32-bit operating systems, the callback option octet is set to 0x06, indicating that the callback is determined during Callback Control Protocol (CBCP) negotiation." Can I change this hex value so that I don't have to enter CBCP and switch it off as the default or something nearly as good? Protocol Compression and Address and Control Field Compression identifiers (Option type 7 and 8 respectively) seem to always be negotiated (to some degree, unsure!). i.e. 0x07 0x02 (type and length, respectively) are sent and received in nearly every LCP negotiation request and acknowledgement. Why is this? Or more importantly, How to I know when compression for both is occurring and how do I turn it OFF? Thanks everyone for your patience. I greatly appreciate any effort answering any of my difficult questions! Take care and Happy New Year! -Shmaff