Shared ethernet over wifi changes 'second machine' subnet

I have a Mac mini (MM) that I connect to the LAN via an access point. I also have a Linux laptop that I want to also share on the LAN. I've connected the laptop into the ethernet port on the MM and I can browse the net. The problem is that where the local subnet is 192.168.x.x the laptop has received an ip address of 192.168.2.x via DHCP.
Consequemntly, I cannot SSH into the laptop via my MM as the two machines now reside on different subnets. I had thought originally that when connecting to a MM, this would 'share' the ethernet port and would simply pass packets between the router and the 'second machine' thus using the MM as in 'bridge' mode.
Is there any reason why the second machine has now received an ip address on a different subnet?

You do need to turn on AFP sharing.. since SMB is not used by TM.. although I have to admit to some confusion..
What application are you using that is spitting out rsync errors?? That is not Time Machine. Are you trying to do this by rsync directly?
You clearly do not have sufficient permissions on the Mac Pro to whatever directory you have set.. make sure you do the rsync with su login.. and make sure on the pro you set full permissions to everyone.
"failed: Permission denied (13)", "*** Skipping everything below this failed directory ***", "failed: No such file or directory (2)", and "rsync error: some files could not be transferred (code 23) at /SourceCache/rsync/rsync-45/rsync/main.c(992) [sender=2.6.9]".
Have you tried Carbon Copy Cloner?? That might be worth it.
Much better than Time Machine for backup over the network.
It is rsync based.
time machine app used in the guide appears to be an older version pre OS X 10.10.3
Another excellent reason to avoid TM.. it is flakey as !heaven in Yosemite.

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    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
    Waiting for index to be ready (101)
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