On 2002.07.24 19:52 kuznet@xxxxxxxxxxxxx wrote:
> No, it is surely not impossible. f.e.
>
> ip neigh add 255.255.255.255 dev dummy0 lladdr ff:ff:ff:ff:ff:ff
Ok, but even in this case there is minor problem. And it lies in
net/ethernet/eth.c - eth_header.
neigh_resolve_output creates header cache with correct ll source and ll
destination as in neighbour, but uses dev->hard_header to build header for
first packet. And eth_header has code:
if (dev->flags & (IFF_LOOPBACK|IFF_NOARP))
{
memset(eth->h_dest, 0, dev->addr_len);
return(dev->hard_header_len);
}
which explicitly sets ll destination to all 0s. For all next packets
hh_cache is used and they get correct ll address (as in neighbour).
Please comment on this patch :) :
--- eth.c.orig Thu Jul 25 16:16:37 2002
+++ eth.c Thu Jul 25 16:16:47 2002
@@ -100,7 +100,7 @@
* Anyway, the loopback-device should never use this
function...
*/
- if (dev->flags & (IFF_LOOPBACK|IFF_NOARP))
+ if (dev->flags & IFF_LOOPBACK)
{
memset(eth->h_dest, 0, dev->addr_len);
return(dev->hard_header_len);
Karlis
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