On 10/7/18 5:08 AM, Joe Zeff wrote: > On 10/06/2018 02:41 PM, Cameron Simpson wrote: >> On 06Oct2018 07:08, fred roller <fredroller66@xxxxxxxxx> wrote: >>> I believe the OP didn't want to use network. In that case a crossover cable >>> would still make rsync the best choice without a network. Uses the nicand >>> you just set a compatible ip on both laptops. >> >> The OP seems concerned that any "using the network" would impact his ISP quota. We just >> need to ensure he uses just his local LAN and make it clear that such traffic never >> goes near his ISP. So the local switch or a direct cable crossover. > > Assuming that his LAN is using NAT and the machines in question have non-routable IPs, > nothing passing between the two would be visible from outside so there's no reason to > worry about quotas. > Your point about "LAN is using NAT and the machines in question have non-routable IPs" is not really valid. I have 8 route-able IPv4 addresses and 18446744073709551616 IPv6 addresses (you read that right) assigned to me. Sticking with IPv4, the devices using them are on the same "physical" network. So, when 2 wish to communicate they make an ARP request and get a MAC address in return. The MAC address (not route-able) is then used for direct communication locally. This is actually true even though my netmask for the assigned IPv4 addresses is 255.255.255.0 since my ISP has deployed VLAN technology in their network. Hence the quotes around physical. (FWIW, none of the hardwired ISP plans in Taiwan have data quotas. :-) ) -- Cardinal Rule of Presentations: "Tell them what you are going to tell them, tell them, then tell them what you told them."
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