VLAN sockets

Does anybody know how to use VLAN sockets in Linux?
Years ago I developed a traffic generator/analyzer tool. Now I would
like to furhter develop it so that I can generate traffic on command
line specified VLANs. Any hint how to do that? I could not found any
useful document or man page about that.
Thanks,
Norbert

Norbert Vegh <(E-Mail Removed)> wrote:
> Does anybody know how to use VLAN sockets in Linux?
> Years ago I developed a traffic generator/analyzer tool. Now I would
> like to furhter develop it so that I can generate traffic on command
> line specified VLANs. Any hint how to do that? I could not found any
> useful document or man page about that.

I would start from

http://www.candelatech.com/~greear/vlan.html

and then look at the source for vconfig. You'll probably find that all
you need to do is to bind() to the appropriate network address when
you want to send packets. That's assuming the the routing table won't
pick the correct interface itself.

--
Cameron Kerr
(E-Mail Removed) : http://nzgeeks.org/cameron/
Empowered by Perl!

Thanks, for the answer. I have already looked into vconfig. However, what I
need is a kind of raw/packet socket where I can explicitly specify the VLAN
header. For me it is not enough to create static VLAN interfaces via vconfig
and send traffic through them.

I also found that the ingress/egress mapping does not do IP prec -> p-bits
mapping and vica-versa. That would really make sense. And also, I cannot turn
of the set_flag parameter, it does not accept 0.

Cameron Kerr <(E-Mail Removed)> wrote in message news:<(E-Mail Removed)>...
> Norbert Vegh <(E-Mail Removed)> wrote:
> > Does anybody know how to use VLAN sockets in Linux?
> > Years ago I developed a traffic generator/analyzer tool. Now I would
> > like to furhter develop it so that I can generate traffic on command
> > line specified VLANs. Any hint how to do that? I could not found any
> > useful document or man page about that.
>
> I would start from
>
> http://www.candelatech.com/~greear/vlan.html
>
> and then look at the source for vconfig. You'll probably find that all
> you need to do is to bind() to the appropriate network address when
> you want to send packets. That's assuming the the routing table won't
> pick the correct interface itself.

Norbert Vegh <(E-Mail Removed)> wrote:
> Thanks, for the answer. I have already looked into vconfig. However, what I
> need is a kind of raw/packet socket where I can explicitly specify the VLAN
> header. For me it is not enough to create static VLAN interfaces via vconfig
> and send traffic through them.

With raw sockets, you must specify what is carried in the packet. This
is done by writing to the buffer which is the packet.

Have a look at libnet. This is a library that allows you to build
arbitrary packets for raw sockets.

--
Cameron Kerr
(E-Mail Removed) : http://nzgeeks.org/cameron/
Empowered by Perl!