Sounds like you're running out of mbufs. Perhaps there is a leak in your version of if_sl.c. (I had this happen once or twice on eneevax before I rewrote most of if_sl.c. Hasn't done it since then....) -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251) UUCP: seismo!umcp-cs!chris CSNet: chris at umcp-cs ARPA: chris at maryland