Re: IPv6 "Jubmo Payload" Broadcast sample for Visual Basic .Net?

From: gregory_may (None)
Date: 03/08/04 

Date: Mon, 8 Mar 2004 08:51:09 -0800

I got this from the IPv6 Group:

> I am developing an application where I need to broadcast information to
> clients. I have hit a 64K limit in UDP broadcasting. I am not exited
> about coding around this problem. It appears IPv4 uses a 2 byte length in
> the header of the message which translates to a 64K Message limit.
>
> It looks like IPv6 may get around this 64K message size problem by using a
> "Jumbo Payload" (check out the IPv6 spec link), it could save me a good
> deal
> of coding headache if I can get a IPv6 Broadcast to work with Jumbo
> Payloads.

The "jumbo payload" option is designed for very high speed networks that
support frame sizes larger than 64K, for example HIPPI and Fibre Channel.
Most networks support only a much smaller frame size, 1536 bytes on classic
Ethernet networks, 9KB on Gigabit Ethernet networks. Unless you work in a
computer center equipped with a very high speed network, you probably cannot
benefit from the jumbo payload.

> I need help answering the following questions:
> * Can I use .Net IPv6 broadcast in place of IPv4 UDP broadcast? It looks
> like the IPv6 structure will broadcast properly on IPv4 equipment for the
> same subnet.

Yes. IPv6 multicast to the IPv6 "all nodes and routers" address will have
the same effect as IPv4 broadcast.

> * Does the .Net implementation of IPv6 implement "Jumbo Payloads" so I can
> get around my 64K message length problem?

No. See above.

> * Does anyone know how to do a IPv6 broadcast in VB.Net. (Got a sample?)
>
> I could not find any .Net samples working with IPv6 broadcast. An example
> of VB.Net doing a IPv6 broadcast would be ideal, but a C# broadcast sample
> would be ok too.

Basically, the behavior is the same as for IPv4 multicast: create an IPv6
UDP socket, bind to the port number you are listening to, and then subscribe
to the multicast group.

-- Christian Huitema

"gregory_may" <None> wrote in message
news:uMXL8VMAEHA.3672@TK2MSFTNGP11.phx.gbl...
> First the research links:
>
> IPv6 spec (look for 'jumbo payload'):
> http://www.cs-ipv6.lancs.ac.uk/ipv6/documents/rfcs/archive/rfc1883.txt
>
> IPv6 Sample C# Client/Server
> http://www.codeproject.com/csharp/ipv6.asp
>
> I am developing an application where I need to broadcast information to
> clients. I have hit a 64K limit in UDP broadcasting. I am not exited
> about coding around this problem. It appears IPv4 uses a 2 byte length in
> the header of the message which translates to a 64K Message limit.
>
> It looks like IPv6 may get around this 64K message size problem by using a
> "Jumbo Payload" (check out the IPv6 spec link), it could save me a good
deal
> of coding headache if I can get a IPv6 Broadcast to work with Jumbo
> Payloads.
>
> I need help answering the following questions:
> * Can I use .Net IPv6 broadcast in place of IPv4 UDP broadcast? It looks
> like the IPv6 structure will broadcast properly on IPv4 equipment for the
> same subnet.
> * Does the .Net implementation of IPv6 implement "Jumbo Payloads" so I can
> get around my 64K message length problem?
> * Does anyone know how to do a IPv6 broadcast in VB.Net. (Got a sample?)
>
> I could not find any .Net samples working with IPv6 broadcast. An example
> of VB.Net doing a IPv6 broadcast would be ideal, but a C# broadcast sample
> would be ok too.
>
> Thanks so much!
>
> Greg.
>
>

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