As a general practice I always try to physically terminate Internet connections directly into a switch so that potentially multiple layer 3 devices such as router or firewall can have a public IP on the directly connected subnet to the Internet service. This has made my life way easier on many occasions due to the flexibility and potential redundancy it provides, particularly when conducting connectivity work remotely.
The vast majority of the time this works without issue. However, I have found that for many broadband/cable modem connections the connection will not perform reliably with this physical configuration. The only way I can get the connection to perform reliably is to physically terminate the cable modem into a router or firewall directly. This isn't the end of the world, but it is less than ideal.
When I say that the connection performs unreliably I mean that oftentimes the directly connected devices will be able to pass traffic for a few minutes or in some extreme cases even a few months before no longer being able to pass traffic. Sometimes power cycling the cable modem resolves the situation and sometimes not.
Has anyone else encountered this problem and (hopefully) found a solution?
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