kak moga da rezerviram DHCP server v edin broadcast
segment?
 vsustnost priemam vsekakvi idei, ako trebva da prava vtora
mreza i 
relay nema problem. ama nemam idea.
 vaznoto e da ne zavisi mrezata samo ot edin DHCP server,
 kakto naprimer i DNS , i NIS si imat slave server, zasto
DHCP nema? ili az ne znam?

Zdravei, kak sa hispanic studentite?
 Ne mi stana iasno kakuv tochno e problema, no eto niakoi
razsuzhdeniia po vuprosa :-)
1.
  Mozhe da ima Primary i Secondary DHCP Server.
 Pogledni tozi link, dali niama da ti svurshi rabota. Toi e za
 failover/loadbalancing na DHCP i mozhe da e tova koeto
tursish.
http://www.lithodyne.net/docs/dhcp/

2.
   Mozhe da razdelish mrezhata na VLAN s niakoi po-inteligenten
 Switch i slozhish portovete na DNS Server-a i Gateway-a da sa
 members i na dvata VLAN-a (ili puskash 2 DNS-a), taka spirash
 broadcast-a oshte na layer 2 ili kato segmentirash mrezhata s
 Router s 2-3 Ethernet interfeisa i vuv vseki segment slagash
DHCP Server (tova mai e po-chistiia nachin).

 Mozhe sushto taka da registrirash MAC adresite na stantsiite v 
 config faila na razlichnite DHCP Server-i i taka da razdavash
fiksirani IP-ta.
 Tova si e dosta pisane, no e nai-evtino i kato si go setnesh
venuzh posle e lesno ;-) 
 Mozhe da ostavish klienta sam da reshi koi DHCP Server da
polzva, no mai tova e neshtoto ot koeto iskash da izbiagash.
 Ako ne ti vurshat rabota tezi predlozheniia, dai povechko info s
 kakuv hardware razpolagash, kakva tochno e tselta i shte pomislim
za neshto drugo.
Sus zdrave!

 znachi tochno tva mi trebvashe - Master i Slave DHCP
serveri
 imah idea da pisha slriptove da copirat leased failovete i
 da puskat rezervnia server ako spre purvia, stoto ne zznaeh
che ima vazmosnost da bachka kato master i slave dhcp.
t.e. predpolagah che ima nachin, ama ne znaeh kak.
sega ste go probvam , dnes ili utre

studentite tuka li ;-)  tupeat ;-) ama nema kak.

imam 2 routera sas dhcp serveri. chuda se ako pusna teh 
 zaedno kak ste se darzat. teh ne moga da im sinhroniziram
 leased filovete ;-) ama moga da gi pusna v razlichni
oblasti.
 naprimer edinia ot 192.168.0.1 do 100 a drugia ot 101 do
200
 imam kam 90 mashinki, stigat mi adresite. vaprosa e kak ste
se darzat mashinkite, mislish li che ste ima problemi?
 ot koj dhcp ste si vzemat adresita? kak ste otgovorat dhcp
 serverite na broadcasta - ste se sastezavat li? nekakav
konflikt dali nema da stane?
kak mislish, Stas?

 CHestno kazano ne sum puskal 2 DHCP Server-a ednovremenno, no
 se porazrovih da procheta i mislia che ako vnimavash da ne se
 zastupvat IP adresite koito razdavat Server-ite, niama
 nikakuv problem da imash i poveche ot 2 v edin fizicheski
segment.
 Konflikt ne bi triabvalo da ima shtoto DHCP klienta si izbira 
 edin ot DHCPOFFER na edin ot Server-ite i mu vrushta
 DHCPREQUEST, a drugite Server-i priemat tozi otgovor za
otkaz.
Pone taka pishe v RFC-to za DHCP :)

---
 The client receives one or more DHCPOFFER messages from one
 or more servers. The client may choose to wait for multiple
 responses. The client chooses one server from which to
 request configuration parameters, based on the configuration
parameters offered in the DHCPOFFER messages.

---
 The servers receive the DHCPREQUEST broadcast from the
 client. Those servers not selected by the DHCPREQUEST
 message use the message as notification that the client has
declined that server's offer.

---
DHCPREQUEST  -  Client message to servers either
 (a) requesting offered parameters from one server and
implicitly declining offers from all others,

 (b) confirming correctness of previously allocated address
after, e.g., system reboot, or

(c) extending the lease on a particular network address.


Taka che stiskam ti paltsi :)

 P.P. Ako uvelichish vremeto za lease (30 dena primerno), shte
 imash i po-malko nesuotvetstvie mezhdu lease faila i
 deistvitelnoto sustoianie na mrezhata, dori i da si
restartiral niakoi ot DHCP Server-ite mezhduvremenno ;)

iasno, 
mersi, ticham da gi puskam ;-)