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тАО07-03-2006 09:47 PM
тАО07-03-2006 09:47 PM
Port 1 is connected to a Cisco router with address 4.4.0.1/19. This router is configured to relay the subnets to the switch. Tagged to VLAN8, untagged for VLAN0
Port 2 is connected to a DHCP server, 4.4.0.20 with several scopes. One of the is VLAN8, 4.4.8.1-100/24 GW 4.4.8.251
Port 3 is a XP client, untagged to VLAN8
The switch itself has the following settings
MSTP,
ip routing
VLAN 8
ip address 4.4.8.251/24
ip helper-address 4.4.0.40/24
ACL allow access to VLAN0 (default vlan)
If I configure the client with static IP, like 4.4.8.34/24 GW 4.4.8.251, then I have access to the switch, DHCP server and router (and WAN).
If I use DHCP I get a "DHCP server unreachable", why?
Solved! Go to Solution.
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тАО07-03-2006 10:00 PM
тАО07-03-2006 10:00 PM
SolutionThe "ip helper-address 4.4.0.40/24" under vlan8 should be "ip helper-address 4.4.0.20/24" which is the DHCP server.
Be sure that ACL allow clients to get the DHCP server.
Don't forget to assign point for any posts.
Good Luck !!!
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тАО07-03-2006 10:49 PM
тАО07-03-2006 10:49 PM
Re: DHCP request problem with VLAN/ACL
I've added the reduced config file of the core switch. Ignore the trunks, the problem also shows on the main switch.
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тАО07-03-2006 11:09 PM
тАО07-03-2006 11:09 PM
Re: DHCP request problem with VLAN/ACL
In your post you mention the XP client is on Port 3 (A3?) untagged in VLAN8. The configuration shows A3 is untagged in VLAN1.
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тАО07-03-2006 11:18 PM
тАО07-03-2006 11:18 PM
Re: DHCP request problem with VLAN/ACL
Some sources say that MSTP is not the best protocol to be used. RSTP should be used, cause this is quicker.
Is this right?
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тАО07-03-2006 11:27 PM
тАО07-03-2006 11:27 PM
Re: DHCP request problem with VLAN/ACL
Change the Scope on the DHCP server for Vlan8 which is : 4.4.8.1-100/24 GW 4.4.8.251, change the Gateway to 4.4.0.1 (the cisco router), in this case you need to add a static route on Cisco router for Vlan8 to point to Vlan1 ip address: ip route 4.4.8.0 0.0.0.255 4.4.0.40
Your problem not in ACL, since assgining static addresses are ok.
Good Luck !!!
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тАО07-03-2006 11:30 PM
тАО07-03-2006 11:30 PM
Re: DHCP request problem with VLAN/ACL
In the configuration:
interface A1
name "CLIENT"
exit
Change A1 to A3.
:)
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тАО07-03-2006 11:51 PM
тАО07-03-2006 11:51 PM
Re: DHCP request problem with VLAN/ACL
What DHCP server are you using?
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тАО07-04-2006 12:04 AM
тАО07-04-2006 12:04 AM
Re: DHCP request problem with VLAN/ACL
Changing the GW of the DHCP server scope won't work since the switch itself takes care of the routing between VLANs.
The cisco router relays all subnet traffic to subnet 0 (VLAN1)
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тАО07-04-2006 12:30 AM
тАО07-04-2006 12:30 AM
Re: DHCP request problem with VLAN/ACL
To start with you should verify that you can assign DHCP addresses in the same VLAN as your DHCP server (VLAN1). If it is unable to this you know the problem is with the DHCP server configuration.