custom message on ping

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Stanley Baxter - 30 Oct 2004 11:54 GMT

hi all

is it possible to reply to a ping request
but using my project to send the reply ?

many thanks

Reply to this Message

AustinMN - 30 Oct 2004 14:08 GMT

The whole idea with a Ping is to go round-trip using the absolute minimum
necessary to do so. As soon as you involve VB (or even Windows, for that
matter) you step outside the purpose of a ping to begin with.

Austin

> hi all
>
> is it possible to reply to a ping request
> but using my project to send the reply ?
>
> many thanks

Reply to this Message

Stanley Baxter - 30 Oct 2004 16:20 GMT

dont you Honestly, think i know that ?
why on earth am i posting a question about this topic
if i haven't already seen it done before with excellant results.

it's an incredibly useful method of doing things which
would help us no-end.

> The whole idea with a Ping is to go round-trip using the absolute minimum
> necessary to do so. As soon as you involve VB (or even Windows, for that
[quoted text clipped - 7 lines]
> >
> > many thanks

Reply to this Message

AustinMN - 31 Oct 2004 00:33 GMT

I know just enough about it to know that it's _extremely_ doubtful that you
have ever seen it done with VB.

Austin

> dont you Honestly, think i know that ?
> why on earth am i posting a question about this topic
[quoted text clipped - 14 lines]
>> >
>> > many thanks

Reply to this Message

Steve Gerrard - 30 Oct 2004 19:28 GMT

> hi all
>
> is it possible to reply to a ping request
> but using my project to send the reply ?
>
> many thanks

Have a read on Ping, which is part of the TCP/IP
specification:

http://www.freesoft.org/CIE/Topics/53.htm

You would have to write a replacement for the TCP/IP
protocol driver bound to your network card driver, in which
you modified the code that handles ICMP messages, which
would probably make your implementation out of spec with RFC
792.

It is very unlikely you could do such a thing in VB6, so the
short answer is no.

Reply to this Message

Stanley Baxter - 31 Oct 2004 11:35 GMT

i just thought maybe something like
winsock listening for the ping could
send a reply, but obviously it's not that
easy to do.

thanks for the advice

> > hi all
> >
[quoted text clipped - 16 lines]
> It is very unlikely you could do such a thing in VB6, so the
> short answer is no.

Reply to this Message

Steve Gerrard - 31 Oct 2004 18:29 GMT

| i just thought maybe something like
| winsock listening for the ping could
[quoted text clipped - 5 lines]
| >
| > http://www.freesoft.org/CIE/Topics/53.htm

At first it seemed like a possibility to me too.

I think the relevant line, from the ICMP link at the link above, is
"ICMP messages, delivered in IP packets, are used for out-of-band
messages related to network operation or mis-operation."

Regular data is sent in TCP or UDP packets, and it is these that a
winsock control will see; ICMP messages are not TCP packets, and are not
seen by a socket. They are intercepted at the TCP/IP driver level, and
are not forwarded "up the chain", but instead are responded to directly
by the driver.

Reply to this Message

Stanley Baxter - 31 Oct 2004 20:05 GMT

ok that makes good sense to me.

many thanks for your help Steve

> | i just thought maybe something like
> | winsock listening for the ping could
[quoted text clipped - 17 lines]
> are not forwarded "up the chain", but instead are responded to directly
> by the driver.

Reply to this Message

VB Forum / General 2 / October 2004

custom message on ping