Messages in this thread | | | Date | Mon, 30 Mar 1998 20:01:22 -0800 (PST) | From | George Bonser <> | Subject | Re: Network/PPP bug? |
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On Mon, 30 Mar 1998, David S. Miller wrote:
> > I don't know jack about PPP in general, but I did snoop around the > code based upon your report of the hangs and I see this in the PPP > driver: > > /* RFC 1331, section 7.2 says the minimum value is 1500 bytes */ > if (mru < PPP_MRU) > mru = PPP_MRU; > > Later, > David S. Miller > davem@dm.cobaltmicro.com >
Hmmm, but 7.2 says no such thing. It only says the DEFAULT is 1500. It says that larger or smaller can be requested but that it must be capable of 1500 for synchronization.
I have noticed this problem as well and simply set the MRU/MTU to 1500 on my link.
7.2. Maximum-Receive-Unit
Description
This Configuration Option may be sent to inform the peer that the implementation can receive larger frames, or to request that the peer send smaller frames. If smaller frames are requested, an implementation MUST still be able to receive 1500 octet frames in case link synchronization is lost.
A summary of the Maximum-Receive-Unit Configuration Option format is shown below. The fields are transmitted from left to right.
0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Maximum-Receive-Unit | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
1
Length
4
Maximum-Receive-Unit
The Maximum-Receive-Unit field is two octets and indicates the new maximum receive unit. The Maximum-Receive-Unit covers only the Data Link Layer Information field. It does not include the header, padding, FCS, nor any transparency bits or bytes.
Default
1500
George Bonser Just be thankful that Microsoft does not manufacture pharmaceuticals. http://www.debian.org Debian/GNU Linux ... the maintainable operating system.
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