Hi,
 I hope you are doing great.
 I am posting this here as I believe Network Programming EXPERTS
visiting this group will help me out.

  Problem: I am trying to send IPV6 HopByHop extension header with
ROUTER ALERT and receive at the other end. For router alert TLV (T=5,
L=2, V=0x0001: RFC 2711). Now I am filling the structure as follows..

   struct msghdr{
      .....
      .....
    msg_control ------|
    msg_controllen=20 |
      .....           |
   }                  |
                      ->  --------------------------------
                         |    cmsg_len = 18                |
                          --------------------------------
                         |  cmsg_level=IPPROTO_IPV6        |
                          --------------------------------
                         |  cmsg_type = IPV6_HOPOPTS       |
                          ---------------------------------
                         |Next Hdr|Next Hdr Len|Type|Length|
                         | 0x00   |     0x00   |0x05|0x02  |
                          ---------------------------------
                         |2-byte value |<--2 bytes pad---->|
                         | 0x00   0x01 |                   |
                          ---------------------------------

           sendmsg(sockFd->fd, &msg, 0);

           The above calling is used to send the HBH extension header.

       I am using Solaris 2.8. Why it is not received at the other
end? Am I filling the structure correctly? Is my padding OK? I also
tried with 6 bytes padding after value.That also didn't work. BUT WHEN
I SEND HOPLIMIT OPTION, I CAN RECEIVE AT THE OTHER END SUCCESSFULLY.
What is going wrong here?

   Thanks in Advance.

  Sagar

In article <bc2f653.0109051145.213a1...@posting.google.com>,
        khan7...@hotmail.com (sagar) writes:

I'd need to see the source code; especially the declarations
of the structures you're using, and the instructions that
load the values in the fields.

What's the machine at your end, SPARC or Intel?
What's at the other end? A SPARC Sol8 machine, or something else?
Is it not received (ie the packet is lost), or isn't it received
correctly?

I can't tell without looking at the actual code.

--
Stefaan
--
Please visit our Webster http://xxxxxxxx.xxxx.xxx, write or e-mail to X&x
promptly,if you are interested.And X&x shall be pleased to render you any
further services.                                      -- Spam from China

Stefaan.Eeck...@ecc.lu (Stefaan A Eeckels) wrote in message <news:727an9.916.ln@justus.ecc.lu>...

 Thanks a lot.
 I figured it out later. I was using all 0x0000 for padding. It has to
be of type 1 (0x0100) as PADN.

In article <bc2f653.0109081343.2dc9f...@posting.google.com>,
        khan7...@hotmail.com (sagar) writes:

That's why it's important to post actual code... Anyway, good
luck with your project. Thanks for following up and letting
me know.

Take care,

--
Stefaan
--
Please visit our Webster http://xxxxxxxx.xxxx.xxx, write or e-mail to X&x
promptly,if you are interested.And X&x shall be pleased to render you any
further services.                                      -- Spam from China