So the DLT messages are reporting this still as 10Base-T ( DLT: Device 1 [eth2] is 1, mtu 1514, header 14 )???
That's ugly because there's then no way to tell them apart... -----Burton -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of frank rizzo Sent: Thursday, April 07, 2005 3:38 PM To: [email protected] Subject: [Ntop-dev] RE: [Ntop] Jumbo frame support question I changed the mtu for the EN10MB DLT type in globals-core.c table to 9000 as you described: _mtuSize[DLT_EN10MB] = 9000; Its a kludge but works for me (my C is weak sauce). Gig ints are now happily plugging away without too-large packet warnings. Thanks! -wP --- Burton Strauss <[EMAIL PROTECTED]> wrote: > 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 > > > > __________________________________ > Do you Yahoo!? > Yahoo! Personals - Better first dates. More second > dates. > http://personals.yahoo.com > > _______________________________________________ > Ntop mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop > > _______________________________________________ > Ntop mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop > __________________________________ Yahoo! Messenger Show us what our next emoticon should look like. Join the fun. http://www.advision.webevents.yahoo.com/emoticontest _______________________________________________ Ntop-dev mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop-dev _______________________________________________ Ntop-dev mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop-dev
