07-02-2015 02:27 PM - edited 03-08-2019 12:49 AM
Hello Everybody,
I'm trying to configure a DHCP Relay on Cisco 7600 with IOS 12.2 (33) SRE3 and I'm having some problems, the home Router tries to forward the packets to the external DHCP server, but the discovery does not reach the server, router debug get a message "DHCPD: bad remote system id length (0 bytes)."
Some friend friend can help me with this obstacle? I researched a lot about that message more found nothing consistent.
interface TenGigabitEthernet2/0/0.180 access
description DHCP-TEST
encapsulation dot1Q 180
ip dhcp relay information trusted
ip address 10.0.0.1 255.255.255.0
ip helper-address 10.90.0.1
.Jul 2 20:49:14.611: DHCPD: htype 1 chaddr 000c.421e.725d
.Jul 2 20:49:14.611: DHCPD: circuit id 4252552d43454e2d30312f342f342f464854542d30306534333832362f31
.Jul 2 20:49:14.611: DHCPD: giaddr = 10.0.0.1
.Jul 2 20:49:14.611: DHCPD: interface = TenGigabitEthernet2/0/0.180
.Jul 2 20:49:14.611: DHCPD: bad remote system id length (0 bytes).
.Jul 2 20:49:14.611: DHCPD: BOOTREQUEST from 0100.0c42.1e72.5d forwarded to 10.90.0.1.
.Jul 2 20:49:14.611: DHCPD: Reload workspace interface TenGigabitEthernet2/0/0.180 tableid 0.
.Jul 2 20:49:14.611: DHCPD: tableid for 10.0.0.1 on TenGigabitEthernet2/0/0.180 is 0
.Jul 2 20:49:14.611: DHCPD: client's VPN is .
.Jul 2 20:49:14.611: DHCPD: bad remote system id length (0 bytes).
.Jul 2 20:49:14.611: DHCPD: using received relay info.
.Jul 2 20:49:14.611: DHCPD: Sending notification of DISCOVER:
.Jul 2 20:49:14.611: DHCPD: htype 1 chaddr 000c.421e.725d
.Jul 2 20:49:14.611: DHCPD: circuit id 4252552d43454e2d30312f342f342f464854542d30306534333832362f31
.Jul 2 20:49:14.611: DHCPD: giaddr = 10.0.0.1
.Jul 2 20:49:14.611: DHCPD: interface = TenGigabitEthernet2/0/0.180
Best Regards.
07-03-2015 01:29 AM
Hi,
I see you are using VPN to connect to the external server.Are you sure that the access lists used in configuring VPN allow the DHCP request to go through?
07-03-2015 06:06 AM
Hello,
I nothing use a VPN to transmit packets DHCP and not have filter in this router.
I will do some more testing and succeed or I will not post the news here.
Thank you for your help.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide