|
Hi, I found the problem in the ipmitool source. Here is what
occur step by step.
SOL received packet is used as the answer for the GetDeviceID instead
of the real GetDeviceId answer. Then, the answer to the GetDeviceId is
interpreted by the SOL red pill function and some garbage is thrown on the
screen (I had already solve a month ago the garbage on the screen bug by
ignoring the answer). This brings me to a
bigger problem. It looks like IPMITOOL is not done in a way that question and
answer can be dissociated. There is no guarantee that packet of a different
payload type could be received in between of question/answer of another type…
or of the same type. For example, a SOL packet can be sent in between a
getDeviceId question/answer. This is for 99% of the time not a problem. Here is what I propose. Instead
of using a getDeviceId for the keepalive mechanism, we could use a simple empty
SOL transmit. (Valid sequence number, no acknowledge, length of 0). This will
trig no work on the BMC side and will no generate also an answer. The impact
on the traffic is lower and we bypass the problem describe above. Also, I can
reset the keepalive timestamp when some other sol packet is transmit.. This
way, no extra traffic if there is already running traffic/ Any problem with that? When the IPMITOOL release
is schedule (1.8.9??) ? I have tried the fix and
for our implementation, it works correctly. Jean-Michel Audet De :
Audet, Jean-Michel Hi,
I am currently developing a SOL implementation on our products. I
periodically loose some data and I just found something. During a short
moment, when the keep alive mechanism send a GetDeviceID packet to the bmc, the
transmit packet to the console are not displayed (not received). I have some way to verify the traffic on our BMC and
the problem occur always during a keep alive GetDeviceID. When I am
disabling the keep alive feature, my problem disappears. I checked a
little bit on the code and so far, I am not sure where the problem is. Anyone see this problem? Any ideas where the
problem might be? It looks like when the GetDeviceId is sent, that no SOL
packet can be sent before the answer is received.. Thanks! Jean-Michel Audet |
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