MESSAGE
| DATE | 2016-04-13 |
| FROM | prmarino1@gmail.com
|
| SUBJECT | Re: [Hangout-NYLXS] confused as to arp tables
|
By the way if there is ever a question about how to NAT a broadcast message I got you covered with the messy answer too. Yes I had to do that full duplex once for a television broadcasting automation system.
Original Message
From: prmarino1-at-gmail.com
Sent: Wednesday, April 13, 2016 20:28
To: Rick Moen; hangout-at-nylxs.com
Subject: Re: [Hangout-NYLXS] confused as to arp tables
They only go as far as the the router.
There is one edge case exceptions to this but generally it's true.
The edge case this is if they are on the same physical local segment and the both are is aware it can route to the second subnet on the physical interface.
Example
"
Ip addr add 111.111.111.111/24 via dev eth0
Ip route add 222.222.222.0/24 via dev eth0
"
And on the other host
"
Ip addr add 222.222.222.222/24 via dev eth0
Ip route add 111.111.111.0/24 via dev eth0
"
But you will only see strange edge cases like this if you work with strange networks like you will find in broadcasting companies :). Or any other place where developers engage in ritual insanity.
Original Message
From: Rick Moen
Sent: Wednesday, April 13, 2016 16:54
To: hangout-at-nylxs.com
Reply To: NYLXS Discussions List
Subject: Re: [Hangout-NYLXS] confused as to arp tables
Quoting Ruben Safir (ruben-at-mrbrklyn.com):
> How can I ping and not have the mac address?
Destination i.root-servers.net is non-local. ARP works only on your
local LAN, i.e., at the level of the link layer and within the
boundaries of a single network, and is not routed across internetwork
nodes.
> The linked layer frame uses the destination
> mac of the Masquaraded router?
Yes, that being the relevant gateway.
> I thought the arps would go upstream all the hops and deliver the mac?
You thought wrong.
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