Slow FTP FCS/Inbound errors

[Tim Killinger]

I'm trying solve a slow FTP tranfer rate problem on my 11.0 rp5450.

- all transfers tested are on local IP segment.
- I 'hardcoded' 100mb full duplex in the NIC and on the hub
- I'm still getting FCS errors and inbound errors while 'getting' files.

lanadmin reports the following:

icgsva1:/pkg/qpk> lanadmin -g mibstats 0

LAN INTERFACE STATUS DISPLAY
Thu, Jan 9,2003 10:57:12

PPA Number = 0
Description = lan0 Hewlett-Packard 10/100 TX Full-Duplex Man
ual TT = 1500
Type (value) = ethernet-csmacd(6)
MTU Size = 1500
Speed = 100000000
Station Address = 0x306e06a63c
Administration Status (value) = up(1)
Operation Status (value) = up(1)
Last Change = 119276203
Inbound Octets = 2437396
Inbound Unicast Packets = 2193
Inbound Non-Unicast Packets = 1813
Inbound Discards = 3
Inbound Errors = 238
Inbound Unknown Protocols = 1478
Outbound Octets = 113501
Outbound Unicast Packets = 1707
Outbound Non-Unicast Packets = 21
Outbound Discards = 0
Outbound Errors = 0
Outbound Queue Length = 0
Specific = 655367

Ethernet-like Statistics Group

Index = 1
Alignment Errors = 1
FCS Errors = 238
Single Collision Frames = 0
Multiple Collision Frames = 0
Deferred Transmissions = 0
Late Collisions = 0
Excessive Collisions = 0
Internal MAC Transmit Errors = 0
Carrier Sense Errors = 0
Frames Too Long = 0
Internal MAC Receive Errors = 0


Advice?

[Ron Kinner]

You have a duplex mismatch. If you set the NIC to 100 Full you have to set the corresponding switch port to 100 Full too. Autonegotiate will not work if one side has been manually set. (Actually it works with the speed but it always sets the duplex to Half which is what the RFC tells it to do don't ask me why.)

Ron

[Tim Killinger]

Problem solved..... it was as simple as a bad cat 5 cable.

My 11 hour file transfer went to 6.2 minutes.

This newbie to UX became somewhat proficient in lanadmin, though!

Thanks!

[rick jones]

glad to see you found the trouble. one minor nit though - if it does full duplex, it ain't a hub, its a switch. a hub is a half-duplex only device where all the attached nodes share the same bandwidth. any one node connected to the hub can see traffic destined for any other node.

a switch is a device that does traffic isolation. traffic between A and B will not (generally) be viewable by C, and will not share bandwidht with traffic between C and D. switches can operatin in half duplex like a hub, or in full-duplex.