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First packet sent?
- To: "'eCos discussion'" <ecos-discuss at sources dot redhat dot com>
- Subject: [ECOS] First packet sent?
- From: "Trenton D. Adams" <tadams at theone dot dnsalias dot com>
- Date: Thu, 18 Oct 2001 10:04:09 -0600
What is the first packet sent when an ethernet interface comes up? Mine
appears to be 42 bytes in length. I see my MAC address and IP address
twice, but I don't know what the other numbers represent.
MAC: 0002 2D2B 8B76 0806
IP: AC10 011E
I've got the interface configured for a static IP
Sending 42 bytes
xmit 42 bytes at a4bd6 sg[1]
000A4BD6: FFFF FFFF FFFF 0002 2D2B 8B76 0806 0001 |........-+.v....|
000A4BE6: 0800 0604 0001 0002 2D2B 8B76 AC10 011E |........-+.v....|
000A4BF6: 0000 0000 0000 AC10 011E |.......... |
WVLAN - RX - status = 8089
rx 14 bytes at d555c sg[0]
000D555C: FFFF FFFF FFFF 0050 BA48 821B 0800 |.......P.H.... |
rx 78 bytes at a4c20 sg[1]
000A4C20: 4500 004E 5BAD 0000 8011 83D1 AC10 0101 |E..N[...........|
000A4C30: AC10 01FF 0089 0089 003A 4A7E EE52 0110 |.........:J~.R..|
000A4C40: 0001 0000 0000 0000 2045 4646 4946 4546 |........ EFFIFEF|
000A4C50: 4345 4645 4E45 4643 4143 4143 4143 4143 |CEFENEFCACACACAC|
000A4C60: 4143 4143 4143 4142 4C00 0020 0001 |ACACACABL.. .. |
I don't know what the first transmit packet is.
I don't know what the First RX packet is, but it has the server MAC
address of 0050 BA48 821B
The second RX packet is a broadcast packet from our server at AC10 0101
Is the first RX packet a "next packet is from this MAC address" packet?
If so, is the FFFF FFFF FFFF a MAC broadcast address indicating this
packet and the next protocol packet is a broadcast packet (AC10 01FF)?
Trenton D. Adams
Extreme Engineering
#17, 6025 - 12 St. SE
Calgary, Alberta, Canada
T2H 2K1
Phone: 403 640 9494 ext-208
Fax: 403 640 9599
http://www.extremeeng.com