Messages in this thread | | | Date | Mon, 23 Mar 1998 17:16:51 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: NETBEUI support? |
| |
On Mon, 23 Mar 1998, Rik van Riel wrote:
> On Sat, 21 Mar 1998, George Bonser wrote: > > > called NFS, and LPD too. Given enough time and money, they might > > eventually invent Unix. > > Yeah, M$-Xenix '98 :-) > A recompile should do... > > Rik.
Some don't understand how much of a problem NETBEUI really is. Every Ethernet packet transmitted as all 1s for the destination hardware address:
This is from Sun's snoop.
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 1 arrived at 11:32:24.48 ETHER: Packet size = 1500 bytes ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast) ETHER: Source = 0:a0:24:e2:35:32, ETHER: IEEE 802.3 length = 1460 bytes ETHER: Ethertype = FFFF (Unknown) ETHER:
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 2 arrived at 11:32:24.76 ETHER: Packet size = 1500 bytes ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast) ETHER: Source = 0:80:c8:16:1d:4e, ETHER: IEEE 802.3 length = 1460 bytes ETHER: Ethertype = FFFF (Unknown) ETHER:
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 14 arrived at 11:32:26.86 ETHER: Packet size = 94 bytes ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast) ETHER: Source = 0:a0:24:17:10:3b, ETHER: IEEE 802.3 length = 80 bytes ETHER: Ethertype = FFFF (Unknown) ETHER:
ETHER: ----- Ether Header ----- ETHER: ETHER: Packet 15 arrived at 11:32:26.86 ETHER: Packet size = 232 bytes ETHER: Destination = ff:ff:ff:ff:ff:ff, (broadcast) ETHER: Source = 0:a0:24:17:10:3b, ETHER: IEEE 802.3 length = 218 bytes ETHER: Ethertype = FFFF (Unknown) ETHER:
ETHER: ----- Ether Header ----- ETHER:
This is not NETBIOS. NETBIOS was developed by IBM and 3COM. It was put into the public-domain. It, and Novel's IPX/SPX were the two main networking mechanisms for PSs until Windoze.
NETBIOS is okay. It is not a bad protocol.
What NETBEUI does is take reasonable NETBIOS packets and encapsulates them inside the BROADCAST packets shown above. Now you get 1500-byte packets that are received by everybody on the LAN. Everybody gets interrupted and has to throw the stuff away. This is a real CPU-Cycle sink.
Cheers, Dick Johnson ***** FILE SYSTEM MODIFIED ***** Penguin : Linux version 2.1.90 on an i586 machine (66.15 BogoMips). Warning : It's hard to remain at the trailing edge of technology.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu
| |