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Netvanta 3200 is preventing clients on remote network from updating from my new DHCP server

Posted on 2011-02-22
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Last Modified: 2012-05-11
I've disabled my old DHCP server and setup a new one.  All my clients on my local network are now requesting leases from my new server no problem.  However  I have a T1 from here to my house with a Netvanta 3200 on each side connecting the two networks (same subnet and everythign).  I didn't configure these at all and I know very little about them but I have a feeling they are causing the problem with the clients on my remote network from updating DHCP.  

When I try a IPCONFIG /RENEW command on a client on the remote network I get the error An error occurred while renewing interface Local Area Connection : unable to contact your DHCP server. Request has timed out.
When I do IPCONFIG /ALL it still shows my old DHCP server.  These are the only clients that do so.

These netvantas are not DHCP servers, all they really do is pass traffic between the networks.  I have about 4 days left on the DHCP leases for these clients before they quit working unless I can figure out why the Netvantas are allegedly blocking the DHCP update.

Here is the config for the HOST netvanta (one on my host network):
!
!
hostname "localNetVanta"
enable password *********
!
ip subnet-zero
ip classless
ip domain-name "domain.local"
ip name-server 192.168.200.6 
no ip routing
!
event-history on
no logging forwarding
no logging email
logging email priority-level info
!
username "atadmin" password "*********"
username "admin" password "**********"
!
banner motd #
                 ****** Important ******

Enable and Telnet passwords are configured to "password".
Please change them immediately.

The ethernet 0/1 interface is enabled with an address of 10.10.10.1
Telnet access is also enabled.



#
!
ip policy-timeout tcp telnet 0
!
!
!
!
!
!
!
!
!
!
interface eth 0/1
  description localNetVanta
  bridge-group 1
  ip address  192.168.200.28  255.255.255.0 
  no ip route-cache
  no shutdown
!
!
!
interface t1 1/1
  description localNetVanta
  clock source internal
  tdm-group 1 timeslots 1-24 speed 64
  no shutdown
!
interface ppp 1
  bridge-group 1
  ip address  192.168.200.28  255.255.255.0 
  no ip route-cache
  mtu 1520
  no shutdown
  cross-connect 1 t1 1/1 1 ppp 1
!
!
!
!
!
no ip tftp server
ip http server
ip http secure-server
no ip snmp agent
no ip ftp agent
!
!
!
bridge 1 protocol ieee
!
!
!
!
!
!
line con 0
  no login
!
line telnet 0 4
  login
  password **********
!
end

Open in new window


Here is my config for the remote netvanta on the remote network:
!
!
hostname "remoteNetvanta"
enable password ********
!
ip subnet-zero
ip classless
ip domain-name "domain.local"
ip name-server 192.168.200.6 
no ip routing
!
event-history on
no logging forwarding
no logging email
logging email priority-level info
!
username "atadmin" password "********"
username "admin" password "********"
!
banner motd #
                 ****** Important ******

Enable and Telnet passwords are configured to "password".
Please change them immediately.

The ethernet 0/1 interface is enabled with an address of 10.10.10.1
Telnet access is also enabled.



#
!
ip policy-timeout tcp telnet 14400
!
!
!
!
!
!
!
!
!
!
interface eth 0/1
  description remoteNetvanta
  bridge-group 1
  ip address  192.168.200.29  255.255.255.0 
  no ip route-cache
  no shutdown
!
!
!
interface t1 1/1
  clock source internal
  tdm-group 1 timeslots 1-24 speed 64
  no shutdown
!
interface ppp 1
  bridge-group 1
  ip address  192.168.200.29  255.255.255.0 
  no ip route-cache
  mtu 1520
  no shutdown
  cross-connect 1 t1 1/1 1 ppp 1
!
!
!
!
!
no ip tftp server
ip http server
ip http secure-server
no ip snmp agent
no ip ftp agent
!
!
!
bridge 1 protocol ieee
!
!
!
!
!
!
line con 0
  login
!
line telnet 0 4
  login
  password **********
!
end

Open in new window


Anyone see whats going on?  Again these netvantas only provide a connection.  No DHCP is done by them, it should be handled by my physical DHCP server
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Question by:DrPcKen
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Accepted Solution

by:
Jan Springer earned 500 total points
ID: 34954133
Does the new machine have the same IP as the old machine?  Have you cleared the arp cache?  Do you have "ip helper" configured?  Have you updated that address?
0
 
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Author Comment

by:DrPcKen
ID: 34954150
New dhcp is a different address.

No I have not cleared arp cache (is that in my firewall?).  I'm not sure about "ip helper" either.  I'll try and find out.
0
 
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Expert Comment

by:Jan Springer
ID: 34954189
"ip helper" relays udp packets to the server specified.
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Author Comment

by:DrPcKen
ID: 34954277
Where would I configure this?  On DHCP server? DNS?
0
 
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Expert Comment

by:Jan Springer
ID: 34954366
On the netvanta -- to tell the netvanta where to forward udp packets for dhcp relaying.
0
 
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Author Comment

by:DrPcKen
ID: 34954943
Ok thanks! I'm looking for a command reference now for ip helper.  Would I need to do this on both netvantas?
0
 
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Author Comment

by:DrPcKen
ID: 34955031
Also, which interface on which netvanta should i put the ip helper on? eth0? t1 1 or ppp 1?

Thank you!!
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Expert Comment

by:Jan Springer
ID: 34955032
I would for consistency.
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Author Comment

by:DrPcKen
ID: 34955149
which interface would the ip helper comand go on? I have  eth0, t1-1 and ppp-1?
0
 
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Expert Comment

by:Jan Springer
ID: 34955198
You put it on the interface to which the packets first arrive.  (eth0)
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Author Comment

by:DrPcKen
ID: 34955202
got it. Thank you! Trying now
0
 
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Author Closing Comment

by:DrPcKen
ID: 34955303
Thank you!
0
 
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Author Comment

by:DrPcKen
ID: 34955306
That did it perfectly! Thank you for your help!
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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