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I checked the debugging log, and I am repeatedly getting a two-line error message from those sites: > I am having trouble recieving files via PPP from certain sites. > modem is configured to only do hardware flow control.
A ppp frame includes fcs software#
> This could happen because of things like software flow-control, which inserts XON/XOFF bytes into the stream to tell the other side to stop sending data. On a link which is error-corrected this probably indicates something is munging bytes on the way through. > error could happen on a link which is not error-corrected. The FCS is used to detect errors in packets which are received. PPP over an async link uses HDLC-like framing for each packet. Maybe I need to examine the packets that are getting sent over to me? Last night I recompiled the kernel (a potato system, I had been using the default 2.2.14 kernel), and this seems to have relieved the problem somewhat - stuff downloads very slowly from the problem sites, but I don't get the timeouts that I was getting. I can load the same pages on my Win95 laptop with no problem with the same ISP, so it appears to be Linux somehow that is doing this. ".something munging bytes on the way through," is what I assume. Cc: Subject: Re: ppp: frame with bad fcs.The flag field consists of the binary sequence 01111110. Flag - A single byte that indicates the end of a frame. By prior agreement, consenting PPP implementations can use a 32-bit (4-byte) FCS for improved error detection.
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Frame check sequence (FCS) - Normally 16 bits (2 bytes). By prior agreement, consenting PPP implementations can use other values for the maximum information field length. The default maximum length of the information field is 1,500 bytes. The end of the information field is found by locating the closing flag sequence and allowing 2 bytes for the FCS field. Data - Zero or more bytes that contain the datagram for the protocol specified in the protocol field. The most up-to-date values of the protocol field are specified in the most recent Assigned Numbers Request For Comments (RFC). Protocol - Two bytes that identify the protocol encapsulated in the information field of the frame. A connectionless link service similar to that of Logical Link Control (LLC) Type 1 is provided. Control - A single byte that contains the binary sequence 00000011, which calls for transmission of user data in an unsequenced frame. PPP does not assign individual station addresses. Address - A single byte that contains the binary sequence 11111111, the standard broadcast address. Flag - A single byte that indicates the beginning or end of a frame. The following descriptions summarize the PPP frame fields illustrated in Figure 3.6 The PPP frame format appears in the Figure Shown below: A family of NCPs for establishing and configuring different network layer protocols An extensible LCP to establish, configure, and test the connection
A ppp frame includes fcs serial#
A method for encapsulating datagrams over serial links PPP provides a method for transmitting datagrams over serial point-to-point links, which include the following three components:
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