Monitoring DHCP Hosts

Hi,
I've installed EM 10g Agent on my notebook, which acquires it's IP via DHCP server in Oracle intranet. The Management Service is installed on a server with a fixed IP.
This is a problem as the Management Service is not able to communicate with my notebook as my hostname is not registered with Oracle's DNS, since the notebook is on DHCP.
Is there a workaround for this? Can we consider that EM 10g Agent can only be installed on hosts with fixed IP, for it work effectively?
Thanks in advance for any help/advice.
Regards,
Kianhui

The agent machine can use DHCP but it must be registered with DNS otherwise it is not possible for OMS to figure out agent target.

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I came across a request to check if it possible to monitor servers hosted on Cloud (Any cloud), servers in cloud are Windows and Centos flavors.
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Pls Note: My request here is about only monitoring servers in the cloud, not the cloud itself.
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- Thanks, Sai

Sure, that's possible.
You will need the Firewall(s) konfigured to allow TCP 5723 from the agent or gateway to the manager. Further, if there is no domain level trust you have to use certificates to achieve that.
https://technet.microsoft.com/en-us/library/dn249696.aspx --> Firewall, Support firewall scenarios
https://technet.microsoft.com/en-us/library/hh487288.aspx --> Security Considerations
https://technet.microsoft.com/en-us/library/hh456447.aspx --> Deploying a Gateway Server
HTH, Cheers,
Patrick
Please remember to click “Mark as Answer” on the post that helped you.
Patrick Seidl (System Center and Private Cloud)
Website: http://www.syliance.com
Blog: http://www.systemcenterrocks.com

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I am looking to monitor dhcp leases from vrf tunnels on a 4510R switch and be notified when a lease is handed out Does anyone have any suggestions on the best way to accomplish this?
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See http://www.cisco.com/en/US/docs/ios/12_4t/12_4t4/ht_iimib.html . Assuming you're running the correct version of code, you can get VRF-aware CISCO-IPSEC-FLOW-MONITOR-MIB and CISCO-IPSEC-MIB support. You will need to make sure you have configured your device to allow for VRF-based SNMP polling. The VRF instances will not show sum totals for the system. To get that, you will need to poll using a non-VRF community string.

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I'm trying to set a host name for myself when using dhcpcd. I have tried both hostnamectl and the hostname variable in dhcpcd.conf. Still, when I try to open an ssh session from another computer, it does not recognize the hostname that I've designated. It looks like DDNS is required for dhcp host names if I'm not mistaken. Would setting DDNS up for my public IP address allow dhcp host names for the router connected to it?
Last edited by boblitz13 (2013-01-16 22:10:51)

Oh I see. Well, is not exactly what I though, but sill can be solved by using dnsmasq.
If your router has DNS, then you only need it to resolve your hostname by the ip. Normally, in my experience, just because the router can detect your hostname, does not pass it to the machines on the lan, You need to specify it using a DNS.
Again, if your router has DNS, just add your laptops ip and its hostname there. (using the router is the easiest way)
If your router does not have DNS, you can configure a DNS server. And thats what dnsmasq is. install dnsmasq on a machine on your lan, and that machine will become your dns server, and add your laptop ip and hostname on the /etc/hosts there.
Now, you'll need that the other machines use your DNS server.
If they run linux, add the ip of the server to /etc/resolv.conf.head of each machine, or, if your router allows it, change the parameters of dhcp, so it assigns the ip of your server as default DNS.
Read the wiki article Dnsmasq, for more information. And, read your router manual to see if it has DNS service.
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is there a way to monitor the number of DHCP leases (show ip dhcp binding) of a DHCP pool created on a 2960 switch?
Regards, Leonardo

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Here is L2 back on line:
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Does that client have a static IP? Is this happening with more than one device?
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Configuring DHCP
WLANs can be configured to use the same or different Dynamic Host Configuration Protocol (DHCP) servers or no DHCP server. Two types of DHCP servers are available: internal and external.
Internal DHCP Server
The controllers contain an internal DHCP server. This server is typically used in branch offices that do not already have a DHCP server. The wireless network generally contains 10 access points or fewer, with the access points on the same IP subnet as the controller. The internal server provides DHCP addresses to wireless clients, direct-connect access points, appliance-mode access points on the management interface, and DHCP requests that are relayed from access points. Only lightweight access points are supported. When you want to use the internal DHCP server, you must set the management interface IP address of the controller as the DHCP server IP address.
DHCP option 43 is not supported on the internal server. Therefore, the access point must use an alternative method to locate the management interface IP address of the controller, such as local subnet broadcast, DNS, priming, or over-the-air discovery.
Note See the Chapter 8 "Controlling Lightweight Access Points," or the Controller Deployment Guide at this URL for more information on how access points find controllers:
http://www.cisco.com/en/US/products/ps6366/prod_technical_reference_list.html
Note A internal DHCP server pool will only serve the wireless clients of that controller, not clients of other controllers. Also, internal DHCP server can only serve wireless clients and not wired clients.
Note DHCP required state can cause traffic to not be forwarded properly if a client is deauthenticated or removed. To overcome this, ensure that DHCP required state is always in disabled state.
External DHCP Servers
The operating system is designed to appear as a DHCP Relay to the network and as a DHCP server to clients with industry-standard external DHCP servers that support DHCP Relay, which means that each controller appears as a DHCP Relay agent to the DHCP server and as a DHCP server at the virtual IP address to wireless clients.
Because the controller captures the client IP address obtained from a DHCP server, it maintains the same IP address for that client during intra-controller, inter-controller, and inter-subnet client roaming.
DHCP Assignment
You can configure DHCP on a per-interface or per-WLAN basis. The preferred method is to use the primary DHCP server address assigned to a particular interface.
Per-Interface Assignment
You can assign DHCP servers for individual interfaces. The management interface, AP-manager interface, and dynamic interfaces can be configured for a primary and secondary DHCP server, and the service-port interface can be configured to enable or disable DHCP servers.
Note See the Chapter 10 "Managing Controller Software and Configurations," for information on configuring the controller's interfaces.
Per-WLAN Assignment
You can also define a DHCP server on a WLAN. This server will override the DHCP server address on the interface assigned to the WLAN.
Security Considerations
For enhanced security, we recommend that you require all clients to obtain their IP addresses from a DHCP server. To enforce this requirement, all WLANs can be configured with a DHCP Addr. Assignment Required setting, which disallows client static IP addresses. If DHCP Addr. Assignment Required is selected, clients must obtain an IP address via DHCP. Any client with a static IP address is not be allowed on the network. The controller monitors DHCP traffic because it acts as a DHCP proxy for the clients.
Note WLANs that support management over wireless must allow management (device-servicing) clients to obtain an IP address from a DHCP server. See the "Using Management over Wireless" section for instructions on configuring management over wireless.
If slightly less security is tolerable, you can create WLANs with DHCP Addr. Assignment Required disabled. Clients then have the option of using a static IP address or obtaining an IP address from a designated DHCP server.
Note DHCP Addr. Assignment Required is not supported for wired guest LANs.
You are also allowed to create separate WLANs with DHCP Addr. Assignment Required disabled; then define the primary / secondary DHCP server as 0.0.0.0 on the interface assigned to the WLAN. These WLANs drop all DHCP requests and force clients to use a static IP address. Note that these WLANs do not support management over wireless connections.
Note See Chapter 4 "Configuring Controller Settings," for instructions on globally configuring DHCP proxy.
Note If you want to specify a static IP address for an access point rather than having one assigned automatically by a DHCP server, see the "Configuring a Static IP Address on a Lightweight Access Point" section for more information.
This section provides both GUI and CLI instructions for configuring DHCP.
Using the GUI to Configure DHCP
To configure DHCP using the GUI, follow these steps:
Step 1 Follow the instructions in the "Using the GUI to Configure the Management, AP-Manager, Virtual, and Service-Port Interfaces" section or "Using the GUI to Configure Dynamic Interfaces" section to configure a primary DHCP server for a management, AP-manager, or dynamic interface that will be assigned to the WLAN.
Note When you want to use the internal DHCP server, you must set the management interface IP address of the controller as the DHCP server IP address.
Step 2 Choose WLANs to open the WLANs page.
Step 3 Click the ID number of the WLAN for which you wish to assign an interface. The WLANs > Edit (General) page appears.
Step 4 On the General tab, unselect the Status check box and click Apply to disable the WLAN.
Step 5 Re-click the ID number of the WLAN.
Step 6 On the General tab, choose the interface for which you configured a primary DHCP server to be used with this WLAN from the Interface drop-down list.
Step 7 Choose the Advanced tab to open the WLANs > Edit (Advanced) page.
Step 8 If you want to define a DHCP server on the WLAN that will override the DHCP server address on the interface assigned to the WLAN, select the DHCP Server Override check box and enter the IP address of the desired DHCP server in the DHCP Server IP Addr text box. The default value for the check box is disabled.
Note The preferred method for configuring DHCP is to use the primary DHCP address assigned to a particular interface instead of the DHCP server override.
Note DHCP Server override is applicable only for the default group.
Step 9 If you want to require all clients to obtain their IP addresses from a DHCP server, select the DHCP Addr. Assignment Required check box. When this feature is enabled, any client with a static IP address is not allowed on the network. The default value is disabled.
Note DHCP Addr. Assignment Required is not supported for wired guest LANs.
Step 10 Click Apply to commit your changes.
Step 11 On the General tab, select the Status check box and click Apply to reenable the WLAN.
Step 12 Click Save Configuration to save your changes.
Using the CLI to Configure DHCP
To configure DHCP using the CLI, follow these steps:
Step 1 Follow the instructions in the "Using the GUI to Configure the Management, AP-Manager, Virtual, and Service-Port Interfaces" section or "Using the GUI to Configure Dynamic Interfaces" section to configure a primary DHCP server for a management, AP-manager, or dynamic interface that will be assigned to the WLAN.
Step 2 Disable the WLAN by entering this command:
config wlan disable wlan_id
Step 3 Specify the interface for which you configured a primary DHCP server to be used with this WLAN by entering this command:
config wlan interface wlan_id interface_name
Step 4 If you want to define a DHCP server on the WLAN that will override the DHCP server address on the interface assigned to the WLAN, enter this command:
config wlan dhcp_server wlan_id dhcp_server_ip_address
Note The preferred method for configuring DHCP is to use the primary DHCP address assigned to a particular interface instead of the DHCP server override. If you enable the override, you can use the show wlan command to verify that the DHCP server has been assigned to the WLAN.
Step 5 Reenable the WLAN by entering this command:
config wlan enable wlan_id

Monitoring DHCP Hosts

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