Simlple problem linking 2 computer...but I cant see what is wrong

Some background: I have a cloned server which I want to do some testing
on. So that I can add it into the network the real server lives on, I
have added another network card to both it and another machine...the
idea being to give fixed IPs to those nics, so once on the first I can
connect to the second.

This is what I have:

Cloned Machine (new card IP is 10.10.0.10)
--------------

eth0 Link encap:Ethernet HWaddr 00:17:315:732
inet addr:10.10.0.10 Bcast:10.10.0.10 Mask:255.255.255.255
inet6 addr: <whatever1>/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:35 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:2347 (2.2 Kb)
Interrupt:233 Base address:0xd000

Routes:
a.b.c.d dev eth0 proto kernel scope link src 10.10.0.10
x.y.z.t/30 dev eth1 proto kernel scope link src x.y.z.2
127.0.0.0/8 dev lo scope link
default via x.y.z.2 dev eth1


Connected Machine (new card IP is a.b.c.d)
-----------------

eth2 Link encap:Ethernet HWaddr 00:01:80:5C:8B:35
inet addr:a.b.c.d Bcast:a.b.c.d Mask:255.255.255.255
inet6 addr: <whatever2>/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:209

Routes (among many others):

10.10.0.10 dev eth2 proto kernel scope link src a.b.c.d


There is a firewall on the connected machine that prevents connection
being initiated from the cloned server, but not the reverse.

However when I ping 10.10.0.10 from a.b.c.d, I get 'Destination Host
Unreachable', and arp who-has requests go unanswered.

I assume I have done something really stupid here, but can't see what.

Philip Warner wrote:
> I assume I have done something really stupid here, but can't see what.

Yep. Bad cables. Sorry all.