Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Ethertype in ATM Driver
I am developing an ATM Driver for Windows NT. Instead of developing a LANE ATM driver I am doing IP Over ATM (RFC 1577) by intercepting ARP Packets and resolving the MAC addresses at the driver level. The requirements are only to support TCP/IP. My driver emulates a Ethernet Adapter. I have a doubt regarding the Ethertype field of the Ethernet Frame. Now I am working with the Ethernet maximum packet size (MTU), which is 1536. All the documentation I have read indicate to use a MTU size of 9180. If I used this MTU I could get a packet of 0x0806 bytes and therefore I wouldn't be able to determine wether the packet was a ARP message or an IP packet of length 0x0806. I guess LANE ATM drivers have the same problems. I have read the ATM Forum document "LAN Emulation Over ATM Version 1.0" and Microsoft Documentation. But I can't understand which frame format to expect and wheter Windows NT will be aware of this. I would appreciate any help. +----------------------------------------------------------+ |David Castells i Rufas INTEC | | http://WWW.intec.es | | dcr@tid.es o o | +_dcr@intec.es_____________________mm__U__mm_______________+
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