Are you using the same process on both systems?
Note the errors here:
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Executing:
/sbin/iptables --table filter --insert FORWARD --destination
10.42.43.0/255.255.255.0 --out-interface eth0 --match state --state
ESTABLISHED,RELATED --jump ACCEPT
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Executing:
/sbin/iptables --table nat --insert POSTROUTING --source
10.42.43.0/255.255.255.0 --destination ! 10.42.43.0/255.255.255.0 --jump
MASQUERADE
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Starting dnsmasq...
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> (eth0): device
state change: ip-config -> activated (reason 'none') [70 100 0]
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Activation (eth0)
successful, device activated.
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Activation (eth0)
Stage 5 of 5 (IP Configure Commit) complete.
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> Activation (eth0)
Stage 4 of 5 (IP4 Configure Get) complete.
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <warn> dnsmasq exited with
error: Network access problem (address in use; permissions; etc) (2)
Sep 13 14:16:30 kristopher-LT21 NetworkManager[503]: <info> (eth0): device
state change: activated -> failed (reason 'sharing-start-failed') [100 120 18
The last two indicate dnsmasq has failed to start because the IP was
already in use. This is likely because on the same link, another system
is already configured to share the connection or there is an issue with
the network's router configuration.
Please verify your settings or provide additional information as to how
your network is configured, how many systems are connected to the wired
network (including things behind a switch or router), and how the other
systems are configured.
Note that ICS uses the 10.42.43.0 range to setup connection sharing.
This is hard-coded.
** Changed in: network-manager (Ubuntu)
Status: New => Incomplete
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Bugs, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/849297
Title:
ICS - Internet Connection Sharing
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https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/849297/+subscriptions
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