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DHCP relay, SA520, SRW2420 and SG200-18

luts_blits
Level 1
Level 1

Hello,

First of all, sorry for my bad English. :-)

i've setup a little network with the following components:

SA520 ---trunk--- SRW2024 ---trunk--- SG200-18

                                 |                                   |

                     PCs, Servers,...                      PCs,...

multiple VLANS: Default: VLAN1  VLANs 10-15, 100 and 120

SA520 is configured as DHCP-Server for VLAN 11-13 and 15. For those 4 VLANs, DHCP works fine.

All Servers are in VLAN 10. Intervlanrouting is active on all VLANS except VLAN 15. DHCP-Relay for VLAN: 1, 10, 14 and 120 are configured with a Windows Server 2008R2 as DHCP-Server, in VLAN 10.

VLANs 1, 14 and 120 work fine when i configure a static IP, but not with DHCP.

I have tried Windows XP, Windows 7, Windows 8 on both Switches and in a VM and with a Mac, but i get no IP.

With Wireshark i tracet on the server and all clients but the only thing i see is a DHCP-Request on the client but non on the Server except VLAN 10.

I think the SA520 not putting throu the DHCP-Request from VLAN 1, 11-15 adn 120 to VLAN 10. Ist there an additional configuration needed?

Regards

Lukas T.

3 Replies 3

Julio Carvajal
VIP Alumni
VIP Alumni

Hello Lukas,

Have you used the ip helper-address command  on lan 1,10,14 and 120??

If not add that command and let us know

Regards

Julio Carvajal
Senior Network Security and Core Specialist
CCIE #42930, 2xCCNP, JNCIP-SEC

Hello jcarvaja,

how can i configure the SA520 over SSH or Telnet?

if you mean the Relay Gateway? yes

Edit:

i discovered a huge DNS problem also.

everey 2nd site i would like to go is not opening. on 2nd try it normaly opens.

Regards

Hello everyone,

the problem is solved now.

It turned out, the hardware was faulti.

Afer exchangeing the hardware it works now.

regards

Review Cisco Networking for a $25 gift card