Brian Hutchinson wrote: > > I have a simple socket program. I've compiled it with gcc on > Debian 1.1 (kernel 2.0.29) and Red Had (Biltmore 2.0.30) and I keep > getting Network is unreachable. > > Running gdb reveals the connect call is not working. > After stepping over the connect, errno = 101. "Network is unreachable" is > displayed by perror and the program exits. > > This is a small program that runs fine under SunOS 4.1.3. The only thing > I had to do to the program was change the include paths from sys/ to linux/. > > My Linux box IP 140.117.43.69 > Netmask 255.255.224.0 > Network 140.117.32.0 > Broadcast 140.117.63.225 > > Can anyone give me a clue as to what the problem might be. I don't know what > to look for at the moment. The only thing I can think of is the above IPs > are not correct. I can ping and telnet to the target which has the server > this > socket program is to connect to. I look in the arp table and it has a > complete > entry. Would arp be able to figure out everything if the above IPs we not > right? > > Thanks in advance for any advice.
When you set up your sockaddr_in do you make sure to use htonl() to convert the IP address to network byte order? I bet you don't! Your program would work on a Sun because Sparc uses big-endian numbers (which are therefore *already* in network byte order) while Intel x86 uses little-endian numbers which must be re-ordered using htonl(). -- Jens B. Jorgensen [EMAIL PROTECTED] -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word "unsubscribe" to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
