10-03-2006
Hi ,
Thanks for your reply.
My problem is when I do have Lom prompt that is when the machine is switched off or in standby.
When i type break then , it will say "machine is in satndby".
Now, I give power on, it will go through a sequence of steps automatically and then end up hanging with "Timeout waiting for ARP/RARP packet " message...
I am unable to get both Lom or oK prompt from this point on...
Please help.
Thanks,
Soumya
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arp(4p) arp(4p)
Name
arp - Address Resolution Protocol
Syntax
pseudo-device ether
Description
The ARP protocol is used to map dynamically between DARPA Internet and 10Mb/s Ethernet addresses. It is used by all the 10Mb/s Ethernet
interface drivers.
The ARP protocol caches Internet-Ethernet address mappings. When an interface requests a mapping for an address not in the cache, ARP
queues the message which requires the mapping and broadcasts a message on the associated network requesting the address mapping. If a
response is provided, the new mapping is cached and any pending messages are transmitted. The ARP protocol queues only the most recently
``transmitted'' packet while waiting for a mapping request to be responded to.
To enable communications with systems which do not use ARP, ioctls are provided to enter and delete entries in the Internet-to-Ethernet
tables. The usage is:
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
struct arpreq arpreq;
ioctl(s, SIOCSARP, (caddr_t)&arpreq);
ioctl(s, SIOCGARP, (caddr_t)&arpreq);
ioctl(s, SIOCDARP, (caddr_t)&arpreq);
Each ioctl takes the same structure as an argument. SIOCSARP sets an ARP entry, SIOCGARP gets an ARP entry, and SIOCDARP deletes an ARP
entry. These ioctls may be applied to any socket descriptor s, but only by the superuser. The arpreq structure contains:
/*
* ARP ioctl request
*/
struct arpreq {
struct sockaddr arp_pa; /* protocol address */
struct sockaddr arp_ha; /* hardware address */
int arp_flags; /* flags */
};
/* arp_flags field values */
#define ATF_COM 2 /* completed entry (arp_ha valid) */
#define ATF_PERM 4 /* permanent entry */
#define ATF_PUBL 8 /* publish (respond for other host) */
The address family for the arp_pa sockaddr must be AF_INET; for the arp_ha sockaddr, it must be AF_UNSPEC. The only flag bits that can be
written are ATF_PERM and ATF_PUBL. ATF_PERM causes the entry to be permanent if the ioctl call succeeds. The ioctl may fail if more than
four permanent Internet host addresses hash to the same slot. ATF_PUBL specifies that the ARP code should respond to ARP requests for the
indicated host coming from other machines. This lets a SUN act as an ARP server, which can be used to make an ARP-only machine talk to a
non-ARP machine.
The ARP protocol watches passively for a host that responds to an ARP mapping request for the local host's address.
Restrictions
ARP packets on the Ethernet use only 42 bytes of data. The smallest legal Ethernet packet is 60 bytes, however, not including CRC. Some
systems may not enforce the minimum packet size.
Diagnostics
duplicate IP address!! sent from Ethernet address: %x:%x:%x:%x:%x:%x
ARP has discovered another host on the local network that responds to mapping requests for its own Internet address.
See Also
inet(4f), arp(8c), ifconfig(8c)
arp(4p)