[Info-vax] SOLVED: Re: tcpip gateway question

[jbriggs444]

On Oct 2, 6:00 pm, glen herrmannsfeldt <g... at ugcs.caltech.edu> wrote:
> Richard B. Gilbert <rgilber... at comcast.net> wrote:
>
> < I'm not certain but I suspect that your problem is due to the fact that
> < DECnet sets the Ethernet address to AA-00-04-00-FB-04.  If you start
> < TCP/IP first, it will get the original hardware address for the
> < interface.  When DECnet starts it will set the address to the DECnet
> < node address and leave TCP/IP swinging in the breeze!
>
> That should only happen until the ARP cache is updated.  Any host
> that tries to connect after the MAC address change will get the
> new address from ARP.  Most will update on the broadcast ARP reply,
> but maybe not all.

Broadcast ARP reply?  What broadcast ARP reply?

ARP requests are broadcasts.
ARP replies are conventionally sent as unicasts.

In the usual case:

The server is expected to cache the client ARP from the broadcast
request.
The client is expected harvest the server ARP from the unicast reply.