Messages in this thread | | | Date | Thu, 15 Feb 2001 12:54:26 -0800 | From | Jordan Mendelson <> | Subject | Re: MTU and 2.4.x kernel |
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Rick Jones wrote: > > > Default of 536 is sadistic (and apaprently will be changed eventually > > to stop tears of poor people whose providers not only supply them > > with bogus mtu values sort of 552 or even 296, but also jailed them > > to some proxy or masquearding domain), but it is still right: IP > > with mtu lower 576 is not full functional. > > I thought that the specs said that 576 was the "minimum maximum" > reassemblable IP datagram size and not a minimum MTU.
RFC 1191 (Path MTU Discovery as it happens):
Plateau MTU Comments Reference ------ --- -------- --------- 65535 Official maximum MTU RFC 791 65535 Hyperchannel RFC 1044 65535 32000 Just in case 17914 16Mb IBM Token Ring ref. [6] 17914 8166 IEEE 802.4 RFC 1042 8166 4464 IEEE 802.5 (4Mb max) RFC 1042 4352 FDDI (Revised) RFC 1188 4352 (1%) 2048 Wideband Network RFC 907 2002 IEEE 802.5 (4Mb recommended) RFC 1042 2002 (2%) 1536 Exp. Ethernet Nets RFC 895 1500 Ethernet Networks RFC 894 1500 Point-to-Point (default) RFC 1134 1492 IEEE 802.3 RFC 1042 1492 (3%) 1006 SLIP RFC 1055 1006 ARPANET BBN 1822 1006 576 X.25 Networks RFC 877 544 DEC IP Portal ref. [10] 512 NETBIOS RFC 1088 508 IEEE 802/Source-Rt Bridge RFC 1042 508 ARCNET RFC 1051 508 (13%) 296 Point-to-Point (low delay) RFC 1144 296 68 Official minimum MTU RFC 791
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