03-20-2011 10:32 AM - edited 03-06-2019 04:10 PM
Hi
We are caught in a weird setup. Recently our company acquired another company. IT services came to our basket for support. Users are running out of IP address. Temporary to fix the issue we added secondary ip address but doesnt seems to help.
(( Internet-cloud))-----Router----PIX-------3560-------LAN
On 3560
vlan 1
ip address 192.168.1.1 255.255.255.0
ip address 192.168.2.1 255.255.255.0 secondary
ip dhcp smart-relay
router eigrp 1
network 192.168.1.0
network 192.168.2.0
ip route 0.0.0.0 0.0.0.0 firewall
DHCP and DNS services are running on same server : 192.168.1.10 255.255.255.0
ISA Server : 192.168.1.100 255.255.255.0
ISA Server is the default-gateway for all users
ISA Server IP is natted on PIX to allow internet browsing
DHCP server got two scope; one for primary IP and one for secondary ip
Any help to see how can users get secondary ip address automatically
thanks
ST
03-20-2011 11:03 AM
Hi there,
You may need an IP helper address on the VLAN 1 interface to ensure that DHCP broadcasts from the secondary subnets get through OK.
interface vlan 1
ip helper-address 192.168.1.10
Hope this helps
Jonathan
03-20-2011 12:50 PM
Hi
I tested IP Helper-address command but didnt help, in this scenario ip helper-address command is not needed as user/server are in the same vlan
Users get ip from primary range but from secondary range users dont get ip address.
DHCP/DNS default gateway is ISA server and users default-gateway is ISA server.
ISA server is with single network card.
ISA Server default-gateway is the 3560-switch
ISA server is running Windows 2003 and microsoft ISA 2006
thanks
ST
03-20-2011 02:08 PM
Hi there,
What DHCP service are you using? I remember something about "Superscopes" being required when using MS DHCP with secondary IP addressing. It basically tells the DHCP server to group multiple subnets into a single logical DHCP pool...
The following technet article explains this in more detail:
http://technet.microsoft.com/en-us/library/cc757614%28WS.10%29.aspx
Hope this helps
Jonathan
03-20-2011 11:51 PM
Thank you
ISA Server is with one network card, how can it forward request for other networks. Do i need to add "Route add " command on Microsoft ISA
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