The FAQ is in the source, and also available HTMLized through About | Help.
There is no explicit support. To the extent jumbo frames are just large
Ethernet frames, ntop will work.
First, let's move this to ntop-dev...
The code to handle "DLT" (Data Link Type) is largely in pbuf.c, although the
table is in globals-core.c.
The mtu table is set in initNtopGlobals(), look for _mtu:
{ int ii;
for (ii=0; ii<MAX_DLT_ARRAY; ii++) {
_mtuSize[ii] = CONST_UNKNOWN_MTU;
_headerSize[ii] = 0;
}
}
_mtuSize[DLT_NULL] = 8232 /* no
link-layer encapsulation */;
_headerSize[DLT_NULL] = CONST_NULL_HDRLEN;
So we need to figure out the values.
Run ntop w/ -t 4 (trace level 4) and grep out the DLT: messages, e.g.:
Apr 1 14:39:21 tigger ntop[2434]: DLT: Device 0 [eth1] is 1, mtu 1514,
header 14
Apr 1 14:39:21 tigger ntop[2434]: DLT: Device 1 [eth2] is 1, mtu 1514,
header 14
That will show how ntop is seeing the frames. It may simply be a matter of
increasing the mtu upper value, or it may be another ethertype, which will
require coding in pbuf.c
-----Burton
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
frank rizzo
Sent: Friday, April 01, 2005 4:39 PM
To: [email protected]
Subject: [Ntop] Jumbo frame support question
I am relatively new to ntop and this list, so I apologize if this is
something that has been covered (the FAQ site is also down apparently).
I have a gig nic that I have enabled jumbo frames on
-- the specific application that I am working with consists primary of
jumbo-frame multicast data. The MTU shows as 1500 in the ntop status -- my
nic is set to 9000. I see no ability to change this in the config of ntop.
Am I missing something? Can ntop deal with jumbo frames?
Thanks,
-wP
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