Re: tcpdump broken after rh9 2.4.20-27.9 kernel upgrade
From: Robert Brown (eli_at_typhoon.xnet.com)
To: email@example.com Date: Sun, 28 Dec 2003 03:45:26 -0600 (CST)
Robert Brown writes:
> Harry Hoffman writes:
> > Wait a sec. You are seeing this same behavior on other boxes? Are they all the
> > same setup? (i.e. RH9->with newest kernel).
> Same kernel on all boxes: 2.4.20-27.9, as of 12/23/03 or 12/24/03, I
> forget which.
Well, egg on my face time again! I now have the 10baseT NIC sniffing
properly on the hub behind the bridge to the internet. It was not
working before because of a bad connection. The thing that tipped me
off was reading over my last reply to this thread "one more time", I
Settings for eth2:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
Advertised auto-negotiation: Yes
Supports Wake-on: pumbg
Current message level: 0xffffffff (-1)
Link detected: no
And then it hit me: the last line says "Link detected: no"! What?
Why not! Well, I started looking at hardware, and I found that where
the ethernet cable plugged into the hub, it was not totally pushed in
all the way. The hub lights should have told me, but either I never
looked there, or it didn't register at the time. I have no idea how
it got pulled out. Those things are supposed to latch! Grrr!
So this proves that promiscuous mode does indeed work, at least on
that NIC running in that mode.
I also re-installed the 2.4.20-20.9, 2.4.20-24.9, and 2.4.20-27.9
kernels. Even when I booted with an earlier kernel, I still could not
see packets that were not addressed to the NIC or broadcast. I am now
starting to suspect something funky about those fancy-schmancy
auto-detecting 10/100baseT hubs! I really wanted a simple 100baseT
hub, but I could not find any that were affordable. How does it make
sense to have a full duplex hub anyway? I do not see how that makes
any sense at all. :-\
I wish I had a scope...
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