I have a basic client/server setup in C which works only if the client and the server are on the same machine. Is there any reason why my client wouldn't be able to send a request to my server if they are on different machines?
In this instance I am running my server on a virtual machine and trying to run the client on my host machine.
Observations:
If I start my server on my VM, and also run the client on the VM and change its address in the client code so that there is a line that says
addr.sin_addr.s_addr = inet_addr("127.0.0.1");
then my server is able to connect with my client. There is no error here and everything occurs as it should.
If I start my server on my VM, but then run my client on my host machine with my VM's IP instead:
addr.sin_addr.s_addr = inet_addr("172.16.225.130");
then this causes an error. The output of trying to run my client as my server runs is:
connect error: No route to host
NOTE: I am able to ping my VM at 172.16.225.130 from my host machine and get a response successfully. But I am NOT able to telnet my VM successfully. It produces the same "No route to host" error.
Server code on virtual machine with IP: 172.16.225.130
int main() {
int sfd, cfd;
int ch = 'k';
int optval = 1;
/* sockaddr_in holds IP address and port info*/
struct sockaddr_in saddr, caddr;
sfd = socket(AF_INET, SOCK_STREAM, 0);
/* set struct sockaddr_in saddr fields */
saddr.sin_family = AF_INET; /* Set address family to IPv4 Internet */
saddr.sin_addr.s_addr = htonl(INADDR_ANY); /* Any internet address */
saddr.sin_port = htons(29008); /* Set server port to 29008 */
setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof optval);
/* Bind address to the socket (sfd) created */
bind(sfd, (struct sockaddr *)&saddr, sizeof(saddr));
listen(sfd, 1);
while (1) {
printf("Server waiting...\n");
cfd = accept(sfd, (struct sockaddr *)NULL, NULL);
/* Read character from client */
if (read(cfd, &ch, 1) < 0) perror("read");
printf("Read character: %c\n from client\n", ch);
ch++;
/* Send incremented character to client */
if (write(cfd, &ch, 1) < 0) perror ("write");
printf("Sent character: %c\n to client\n", ch);
/* Close connection with client by closing the client fd */
close(cfd);
}
return 0;
}
Client code on my host machine
int main() {
int cfd;
struct sockaddr_in addr;
char ch = 'r';
cfd = socket(AF_INET, SOCK_STREAM, 0);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr("172.16.225.130");
addr.sin_port = htons(29008);
if (connect(cfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("connect error");
return -1;
}
if (write(cfd, &ch, 1) < 0) perror("write");
if (read(cfd, &ch, 1) < 0) perror("read");
printf("nReply from Server: %cnn\n", ch);
close(cfd);
return 0;
}
EDIT: Here are things I've tried already and still do not work.
1. Opened up port 29008 in my VM:
Appended rule in my /etc/sysconfig/iptables file:
-A INPUT -m state --state NEW -m tcp -p tcp --dport 29008 -j ACCEPT
Saved and closed the file. Restarted iptables:
/etc/init.d/iptables restart
2. Allowed requests to be received by each other by configuring firewall settings:
On VM: sudo iptables -A INPUT -s 172.16.225.1 -j ACCEPT
On host: sudo iptables -A INPUT -s 172.16.225.130 -j ACCEPT
3. Turned off my iptables on my VM completely. This produced a different result. Instead of a "No route to host" error occuring, running my client causes it to just hang.
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It was generated by a neural network.