Guest RW Posted March 12, 2008 Posted March 12, 2008 could not find group strictly dealing with DHCP so I guess I try here... if there are 2 or more DHCP servers in LAN (same subnet) and they all configured with single scope IP range where each of this server has excusion set so they do not overlap each other i.e. DHCP1 scope 10.1.1.1 - 10.1.1.150 excluded 10.1.1.1 - 10.1.1.100 DHCP2 scope 10.1.1.1 - 10.1.1.150 excluded 10.1.1.50 - 10.1.1.150 DHCP3 scope 10.1.1.1 - 10.1.1.150 excluded 10.1.1.1 - 10.1.1.50 excluded 10.1.1.100 - 10.1.1.150 or in second scenario: 3 DHCP server set up with 3 different IP ranges for their scopes so they do not overlap each other again, how clients get IPs assigned which one of these 3 DHCP servers will lease IP first, what is driving this assigment?
Guest Bill Grant Posted March 13, 2008 Posted March 13, 2008 Re: multiple DHCP If you have three DHCP servers set up like that, the clients would get their config more or less at random. A client simply broadcasts a DHCP request on the network and waits for an offer. The client will probably accept the first offer it receives. There is no way to predict which DHCP server would reply first. The situation is different after the initial DHCP offer is received. The client will try to renew its existing lease before it expires, rather than simply broadcasting a request for an offer. "RW" <RW@discussions.microsoft.com> wrote in message news:F1EF4BCF-3EAC-413E-B2DC-BD539DCE3CBB@microsoft.com... > could not find group strictly dealing with DHCP so I guess I try here... > if > there are 2 or more DHCP servers in LAN (same subnet) and they all > configured > with single scope IP range where each of this server has excusion set so > they > do not overlap each other i.e. > DHCP1 scope 10.1.1.1 - 10.1.1.150 > excluded 10.1.1.1 - 10.1.1.100 > > DHCP2 scope 10.1.1.1 - 10.1.1.150 > excluded 10.1.1.50 - 10.1.1.150 > > DHCP3 scope 10.1.1.1 - 10.1.1.150 > excluded 10.1.1.1 - 10.1.1.50 > excluded 10.1.1.100 - 10.1.1.150 > > or in second scenario: > 3 DHCP server set up with 3 different IP ranges for their scopes so they > do > not overlap each other again, how clients get IPs assigned which one of > these > 3 DHCP servers will lease IP first, what is driving this assigment? > > >
Guest RW Posted March 13, 2008 Posted March 13, 2008 Re: multiple DHCP Bill, You said "..If you have three DHCP servers set up like that.." so this kind of sounds like you mean this should not be setup like that, so what's the prefered way of setting up DHCP server for full folarance? "Bill Grant" wrote: > If you have three DHCP servers set up like that, the clients would get > their config more or less at random. > > A client simply broadcasts a DHCP request on the network and waits for > an offer. The client will probably accept the first offer it receives. There > is no way to predict which DHCP server would reply first. > > The situation is different after the initial DHCP offer is received. The > client will try to renew its existing lease before it expires, rather than > simply broadcasting a request for an offer. > > > "RW" <RW@discussions.microsoft.com> wrote in message > news:F1EF4BCF-3EAC-413E-B2DC-BD539DCE3CBB@microsoft.com... > > could not find group strictly dealing with DHCP so I guess I try here... > > if > > there are 2 or more DHCP servers in LAN (same subnet) and they all > > configured > > with single scope IP range where each of this server has excusion set so > > they > > do not overlap each other i.e. > > DHCP1 scope 10.1.1.1 - 10.1.1.150 > > excluded 10.1.1.1 - 10.1.1.100 > > > > DHCP2 scope 10.1.1.1 - 10.1.1.150 > > excluded 10.1.1.50 - 10.1.1.150 > > > > DHCP3 scope 10.1.1.1 - 10.1.1.150 > > excluded 10.1.1.1 - 10.1.1.50 > > excluded 10.1.1.100 - 10.1.1.150 > > > > or in second scenario: > > 3 DHCP server set up with 3 different IP ranges for their scopes so they > > do > > not overlap each other again, how clients get IPs assigned which one of > > these > > 3 DHCP servers will lease IP first, what is driving this assigment? > > > > > > > >
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