Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!rutgers!njin!knutsen From: knutsen@pilot.njin.net (Mark Knutsen) Newsgroups: comp.sys.mac.hypercard Subject: Re: Still looking for ping... Message-ID: Date: 12 Apr 91 14:02:44 GMT References: <1991Apr11.145931.5148@biostr.washington.edu> Organization: NJ InterCampus Network, New Brunswick, N.J. Lines: 19 >resnick@cogsci.uiuc.edu (Pete Resnick) responds: >>> MacTCP does not currently allow you access to ICMP, which is the >>> part of the TCP/IP protocol suite which 'ping' uses. kraig@biostr.washington.edu (Kraig Eno) writes: >MacTCP lets you send and receive TCP packets on any socket number. I >don't know just how ping really works, but if you look at the man page, > ... >Anyone with Unix source [to ping] want to check and see if it uses port 7? Pete Resnick is correct, the standard 'ping' uses ICMP, not TCP. Still, the method Kraig Eno describes is a perfectly fine way to determine if a host is alive. After all, what good is a host if TCP isn't running? :-) -- =============================================================================== Mark Knutsen, now located in New Haven, CT. Same old email address: knutsen@pilot.njin.net OR knutsen@pilot.rutgers.edu OR {...}!rutgers!knutsen