Thanks for the suggestions to put things onto separate subnets. This seems to
be the answer (haven't been able to change things yet, all the machines are
actually in the US and I haven't got in touch with the guy who has physical
access). I can only assume that the setup worked originally because the modules
and routing info were added when Red Hat was looking the other way, but after
a reboot the system recognised the need to add routes, and things broke
because the broken configuration added broken routes. Interesting that it wasn't
recognised as an invalid config, and actually worked fine, until after the
reboot.
Thanks again,
Tom
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