Re: disabling checksums flag

[Hannes Gredler <hannes () juniper net>]

alex,

could you give some insight why one generally wants to have
checksumming turned off rather than just turning the
warning messages off ?

if there are good reasons for both options
then i'd propose that we still do the checksumming
verification suppression,based on your flag;
call it a checksum verification flag ...

i.e.

12:36:45.587565 OSI, IS-IS, length: 405
        hlen: 27, v: 1, pdu-v: 1, sys-id-len: 6 (0), max-area: 3 (0), pdu-type: L2 LSP
          lsp-id: 2092.1113.4009-00, seq: 0x000002fd, lifetime:  1198s
          chksum: 0xe984 (correct), PDU length: 405, L1L2 IS
                         ^^^^^^^^^
becomes with k flag

12:36:45.587565 OSI, IS-IS, length: 405
        hlen: 27, v: 1, pdu-v: 1, sys-id-len: 6 (0), max-area: 3 (0), pdu-type: L2 LSP
          lsp-id: 2092.1113.4009-00, seq: 0x000002fd, lifetime:  1198s
          chksum: 0xe984, PDU length: 405, L1L2 IS

/hannes

On Fri, Jul 18, 2003 at 12:55:50PM -0500, alex medvedev wrote:
| hallo,
| 
| i would like to add a disable checksum flag to tcpdump.
| 
| i assume this will affect ip, tcp, udp, icmp, icmp6, isoclns, igmp, vrrp,
| mobile printers, and tcpdump.c file (is it all?)
| 
| proposed change:
| add a global int cksumflag=1 in tcpdump.c :)
| add a command line flag: k (?),
| which when specified disables the checksum calculation (cksumflag=0);
| check cksumflag before calculating checksums in printers.
| 
| i attached the patch against today's cvs, which worked on my setup,
| but i have no idea what some printers do, so, please, let me know
| if there is more changes needed or things should be done differently.
| 
|  ???
| 
| thanks,
| 
| -alexm
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