On Sat, 1 Sep 2001, Paul Chvostek wrote:
> FWIW, on aliased IPs, I seem to be unable to generate the who-has arps
> unless I specify the netmask. Just doing "ifconfig if0 a.b.c.d alias"
> does not seem to be sufficient. But the actual value of the netmask
> should not affect ARP, since ARP doesn't know about CIDR.
I see the same behaviour (as predicted by Ruslan). A full
ifconfig <interface> inet <address> netmask <mask> alias is required.
> I'd still like to know how to generate a gratuitous is-at. I mean,
> besides forging it in dsniff's arpspoof.
I think the base system lacks the tools. You may be able to roll-your-own
with appropriate ioctls, this being all ifconfig does in practise.
However, none of them seem documented to perform any immediate ARP
functions, this being a side-effect of their functionality at best.
I think, ultimately, the only guaranteed way is to construct your own ARP
packet and write it at the link layer. arping uses libnet for this.
Joshua
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