Blocking entire LAN

[salocinx]

A few times the Plipbox snaps into a very strange state. In that state, my extra send/receive indicator LED does not extinguish anymore and the Plipbox seems to flood the LAN with network packets. When this is the case, no computer attached to the LAN is able to send/receive any network traffic anymore. Restarting the Plipbox solves the issue.

Reproduction procedure (tested with firmware v0.5):
Power on the Plipbox and then your Amiga. Start TCP/IP stack, connect Plipbox to the network and download some large file. Power off your Amiga during the download. The Plipbox begins to jam the network and all other computers on the network have no more access to the LAN/WAN.

[cnvogelg]

by default plipbox does flow control on the ethernet link. if this is not handled correctly you can stall your network.
you can disable flow control with the fc command in the command mode on the serial console.
to debug this issue it would be helpful to get a serial log of plipbox's output

[salocinx]

Okay I managed to connect with CoolTerm/Windows to my Plipbox. I did tests with firmware 0.5 and 0.6. The Plipbox with firmware 0.6 did not jam the network with the procedure described in my initial post, whereas the Plipbox with firmware 0.5 did.

Here are the logs for version 0.5 after shutting down the Amiga while downloading a larger file (network jamming):

Welcome to plipbox 0.5 20161220
by lallafa (http://www.lallafa.de/blog)

fd: full duplex 00
fc: ETH flow ctl 01
fe: filter ETH 01
fp: filter PLIP 01

dd: dump dirs 00
de: dump ETH 00
di: dump IP 00
da: dump ARP 00
dp: dump proto 00
dl: dump plip 00

la: log all cmds 00

enc28j60: rev 07 half duplex
000107.6788 pbp(rx): online: mac=1A:11:AF:A0:47:11 ver=00.05
000107.6894 pbp: link up
000107.6940 eth: link up
000144.8281 io: 22 43 1514 000000.0183 000000.0026

Here are the logs for version 0.6 after shutting down the Amiga while downloading a larger file (no network jamming):

Welcome to plipbox 0.6 20150117
by lallafa (http://www.lallafa.de/blog)

m: mac address 1A:11:AF:A0:47:11

fd: full duplex 00
fc: flow control 00

tl: packet len 05EA
tt: packet type FFFD
ti: ip address 192.168.002.222
tp: udp port 1A90
tm: test mode 00

Press to enter command mode or <?> for key help
000000.0581 [BRIDGE] on
000000.0624 pio: init: enc28j60: ok! mac=1A:11:AF:A0:47:11 flags=04 rev=07
000001.3418 FIRST INCOMING!
000001.3474 OFFLINE DROP: 00D7
000002.5289 cmd=00?? ERR:04
000004.3698 OFFLINE DROP: 00D7
000007.3972 OFFLINE DROP: 00D7
000010.4244 OFFLINE DROP: 00D7
000013.4518 OFFLINE DROP: 00D7
000016.4791 OFFLINE DROP: 00D7
000019.5067 OFFLINE DROP: 00D7
000022.5338 OFFLINE DROP: 00D7
000025.5611 OFFLINE DROP: 00D7
000028.5884 OFFLINE DROP: 00D7
000031.6158 OFFLINE DROP: 00D7
000034.6431 OFFLINE DROP: 00D7
000037.6704 OFFLINE DROP: 00D7
000040.6980 OFFLINE DROP: 00D7
000043.7251 OFFLINE DROP: 00D7
000046.7525 OFFLINE DROP: 00D7
000049.7798 OFFLINE DROP: 00D7
000052.8072 OFFLINE DROP: 00D7
000055.8345 OFFLINE DROP: 00D7
000058.8618 OFFLINE DROP: 00D7
000061.8892 OFFLINE DROP: 00D7
000064.9165 OFFLINE DROP: 00D7
000067.9439 OFFLINE DROP: 00D7
000070.9712 OFFLINE DROP: 00D7
000073.9985 OFFLINE DROP: 00D7
000077.0259 OFFLINE DROP: 00D7
000080.0532 OFFLINE DROP: 00D7
000083.0805 OFFLINE DROP: 00D7
000086.1078 OFFLINE DROP: 00D7
000089.1352 OFFLINE DROP: 00D7
000089.4431 OFFLINE DROP: 00F9
000089.4490 OFFLINE DROP: 005C
000089.6281 OFFLINE DROP: 005C
000089.6342 OFFLINE DROP: 00D8
000089.6401 OFFLINE DROP: 005C
000092.1625 OFFLINE DROP: 00D7
000095.1902 OFFLINE DROP: 00D7
000098.2172 OFFLINE DROP: 00D7
000101.2445 OFFLINE DROP: 00D7
000104.2719 OFFLINE DROP: 00D7
000107.2992 OFFLINE DROP: 00D7
000110.3265 OFFLINE DROP: 00D7
000113.3539 OFFLINE DROP: 00D7
000116.3675 [MAGIC] online
000116.4085 FIRST TRANSFER!
000210.8963 cmd=FF?? ERR:04

Let me know if and how I can provide you more information on this issue.

[salocinx]

I guess this issue is also solved by forwarding the _RESET signal to the Plipbox as I described here.