I have a network A with a old dhcp server (call it server A) I want to get rid off. I have set up a dhcp-relay on the main L3 switch (also gateway) to my other dhcp server (on network B, call it server B) and I have added a scope for network A on it.
As today, both dhcp server respond to dhcp request for network A (obviously, only a small part get a IP from B because server A is much closer). But, if I set the scope down on server A, no one get an IP. Why?
I can ping server B from any machine in network A, so, it's not a routing issue.
Any guess where I need to look?
I know I may need to wireshark the sh*t out of this, but I just can't understand why my dhcp-relay seems to work only when server A is operating.
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