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I worked at an ISP. The DHCP server we use for our DSL offering was made in the 90s and hasn't been updated since.
If it works and is secure, what's the problem
Frankly, I don't see this a a problem as long as the software is up to date and the hardware is sound. I bet there are thousands of SPARC servers out there processing data 24/7 since 1995.
Might want to get on updating it soon for IPV6 though
I've worked for a few of the larger ISPs in the US. They all have their own special weird shit like a windows NT machine shoved in a corner in a CO in west Texas that you have to remote desktop into and run some java applet from the 90 to log into a hardwired machine from the 70s just to set up a voicemail box for a phone line. Ain't broke don't fix it leads to some wild setups at companies you wouldn't expect it from.
I'd actually rather this than making new software with all kinds of bugs