[lug] Backup

[Bear Giles]

David L. Anselmi wrote:
> DHCP, even though it is a broadcast protocol, can be relayed across 
> routers.  ISC's suite of DHCP software will do this.  Cisco has a "DHCP 
> helper" or some such that does the same thing.  So does Microsoft.  So 
> as long as there's a relay agent on your subnet the DHCP server can be 
> anywhere.

Yes, but.

Yes, you can relay DHCP across routers.  But that's intended for 
enterprises, e.g., the CU campus or Comcast.  A SOHO user (practically 
by definition) is on a single subnet and probably has no more than a few 
dozen systems.

As a practical matter does anyone route DHCP across the public internet?

> The kernel image is downloaded with TFTP, which is a typical point to 
> point protocol using TCP.

Again, "yes, but."  TFTP within your own network is one thing, doing 
TFTP across the public internet is asking for trouble.

Bear