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UPDATE:
During lunch I rebooted the DHCP server (it's also a domain controller so I wanted to wait for lunch) 10.10.2.20 ...
I can now ping 10.10.2.20 from 10.30.10.14 ...
I still can't ping 10.30.10.14 from 10.10.2.20.
This may be a firewall issue (10.30.10.14 is running ISA 2004). I can't find any explicit rules that prevent pings from 10.10.x.x network though.
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