RE: Socket question? Network unreachable

1997-12-12 Thread Lewis, James M. 
Without seeing the program, it's hard to tell.  I suspect that you have a 
big-endian/little-endian problem.  Try getting the addr with gethostbyname 
or convert the ip-addr directly with inet_addr.

jim

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Subject:Socket question? Network unreachable

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.

Brian


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Re: Socket question? Network unreachable

1997-12-12 Thread Jens B. Jorgensen 
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]


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