Constant DHCP OFFER DHCP DECLINE on ISP Interface of DHCP Server
Hi, hopefully I'm not asking too stupid a question. I'm a 4 year linux hobbyist who has set up a Debian machine as a gateway/DHCP server. I updated today and now notice a constant DHCP OFFER and DHCP DECLINE connection to what I assume is my ISP's DHCP server address.
Sniffing in tshark gives me a steady stream of offers and declines followed by an ACK a fraction of a second pause and then the cycle starts again. I have had this Debian setup (several installs) for several years now and never noticed this behavior so I am unsure where to look.
iftop shows a constant connection,
255.255.255.255:bootpc => 10.X.X.X:bootps
with all the bandwidth happening on the <= side.
It exists only the external interface and doesn't originate from the inside network. Previously this connection was occasional and I want to know why it's bursting more frequently. I can connect to the internet from the internal network machines and the gateway so there's no service disruption and I have an external IP address.
I am on a different machine so no logs, but I can produce them if you need them. Again, curious why it's bursting so frequently.
Any insight would be greatly appreciated and I thank you for your time.