The Packet Socket option must be included in any custom-compiled 2.2 kernel or IPTraf will not work. Neither will tcpdump and other packet capture software. Caveats Synchronous PPP over ISDN had problems with earlier versions of IPTraf but reports came in saying the problems disappeared with kernel 2.0.34. Support has then been restored in 1.3.0, but users are advised to keep it under observation. If you're running a kernel version prior to 2.0.35, you are advised to upgrade for security reasons, as well as for the various ISDN bugfixes.
FDDI support is still in a fairly experimental stage.
Users are advised to keep it under observation, and report any problems. The main data structures used by the various facilities are doubly-linked lists. This makes it easier to scroll forward and backward, and the maximum number of entries is limited only by available memory. Search operations on most facilities, are performed linearly, and have a mild hit, but is usually not noticeable. The IP Traffic Monitor, though uses a hash table for better search efficiency, due to its propensity to grow quite rapidly.