Windows 98 network not working

I hve a network of 2 win98 machines connected via a switch and a broadband
connection out to the internet. Both machines can connect to the internet,
but they can't see each other.

They both have file sharing turned on and are sharing resources. I can ping
the network address of the other machine on both.

On one machine 1 in the network neighbourhood folder, I get the entire
network icon and the icon for itself, sometimes this one can see machine 2
and share the resources.

On machine 2, I see the entire network icon but nothing else, not even itself.

I have gone over all the settings numerous times and as far as I can see
they are correct and I can't see why the network isn't working

Any suggestions?