Date: Wed, 18 Jul 2012 15:14:28 +0530 From: Deepak Kumar <dk311990@gmail.com> To: freebsd-net@freebsd.org Subject: determine the nic pairs Message-ID: <CAELRkmeex3b_dn5B-mi%2BDY4Ax8RhYXFgPYOG8JUxJ2jW7m8=9A@mail.gmail.com> In-Reply-To: <CAELRkmc_h57zqHoUUkptzugLAM7t6gvmbWRJDrTFXMbjBzYaKg@mail.gmail.com> References: <CAELRkmc_h57zqHoUUkptzugLAM7t6gvmbWRJDrTFXMbjBzYaKg@mail.gmail.com>
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Hi Enthusiast,
I have a server which has around 20 nic interfaces.
Some are connected port to port via cross cable and some are connected via
a switch and few are not connected.
(Let consider all are connected port to port)
I want to find out the way so that I can determine the pairs efficiently.
I assigned ip starting from 172.x.x.30 with netmask 255.255.255.0
I created as many sockets as there are interfaces with
socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
then I bind the all but one interfaces to the ip I gave using
bind(sockfd, (struct sockaddr *)&in, sizeof(in));
where in is something like
bzero(&in, sizeof(in));
in.sin_family = AF_INET;
in.sin_port = htons(2074);
in.sin_addr.s_addr = inet_addr("172.x.x.30+interfaceno");
and one left socket I did
socket creation and using setsockopt I did
int option = 1;
setsockopt(sockfd[counter], SOL_SOCKET, SO_BROADCAST, &option,
sizeof(option));
and do
sendto(sockfd, arr, sizeof(arr), 0, (struct sockaddr *)&in, len);
where in is
bzero(&in, sizeof(in));
in.sin_family = AF_INET;
in.sin_port = htons(2074);
in.sin_addr.s_addr = inet_addr(172.x.x.255);
Now I want to send the packet from one interface and who ever receive
should be its partner.
But when I do recvfrom for one socket it blocks and I am not able to
implement timeout for it.
select is not working as it need file discripter and socket call is
returning struct socket.
So how should I implement timeout in recvfrom or use there exist some
equivalent of select for struct socket
or any other way to implement this.
PS: Ping is working fine in determining the pair but taking to much time.
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