25.08.2005 03:02, Daniel Brockman wrote/a écrit:
Hi list,
If I understand correctly, packets sent to the all-ones
broadcast address only go out through a single interface.
Hello,
I have some blur memories about this kind of issue, so my answer my be
wrong on some points...
My question is threefold:
1. Why doesn't Linux send 255.255.255.255 packages through
all network interfaces? (I realize that this is
probably not a Linux-specific question.)
IIRC, Linux 255.255.255.255 as a normal IP address. Therefore it will
follow the route for such an address and select the interface it is
associated (probably eth0 if you are on a LAN).
2. How does it choose which interface to send through?
My first guess was that it just took the first Ethernet
interface and used that for broadcasting. But playing
around with nameif, this seems not to be the case.
cf 1
3. Can I set the default broadcast interface explicitly?
For example, say I wanted broadcasts to go out over eth1
by default, instead of over eth0. What if I wanted them
to get sent through tap0?
Again, I'm not sure, but I think that you can force the interface by
adding a special route for IP 255.255.255.255 and with mask
255.255.255.255 to the interface you want.
[sniped]
Hope this help, even if my memory is a bit confused,
Eric
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