DHCP Binding oid

Dears;
Kindly i need the OID for the DHCP binding.
Best Regards
Nadeem Saleem

Hi Nadeem:
In a 6509 with the IOS DHCP server configured, there are several objects in the CISCO-IETF-DHCP-SERVER-MIB for the various statistics involved. Among them are:
                        cDhcpv4CountDiscovers,
                        cDhcpv4CountOffers,
                        cDhcpv4CountRequests,
                        cDhcpv4CountDeclines,
                        cDhcpv4CountAcks,
                        cDhcpv4CountNaks,
                        cDhcpv4CountReleases,
                        cDhcpv4CountInforms,
                        cDhcpv4CountInvalids,
                        cDhcpv4CountDropUnknownClient,
                        cDhcpv4CountDropNotServingSubnet,
                        cDhcpv4ServerSharedNetFreeAddrLowThreshold,
                        cDhcpv4ServerSharedNetFreeAddrHighThreshold,
                        cDhcpv4ServerSharedNetFreeAddresses,
                        cDhcpv4ServerSharedNetReservedAddresses,
                        cDhcpv4ServerSharedNetTotalAddresses
You might want to just try walking ciscoIetfDhcpSrvMIB and see what all comes out and which numbers work for you.

Similar Messages

How to synchronize between DHCP binding table and DHCP snooping table ?

I clear DHCP snooping table with command "clear ip dhcp snooping binding " , and PC can't communicate with other any more. So how to synchronize between DHCP binding table and DHCP snooping table ?
dhcp-test#sh ip dhcp bind
IP address Client-ID/ Lease expiration Type
Hardware address
99.1.65.32 0100.1125.353c.25 Mar 02 1993 01:05 AM Automatic
99.1.65.33 0100.1438.059f.85 Mar 02 1993 12:01 AM Automatic
dhcp-test#sh ip dhcp snooping binding
MacAddress IpAddress Lease(sec) Type VLAN Interface
Total number of bindings: 0
thanks!

ip dhcp snooping binding mac-address vlan vlan-id ip-address interface interface-id expiry seconds
Add binding entries to the DHCP snooping binding database. The vlan-id range is from 1 to 4904. The seconds range is from 1 to 4294967295.
Enter the above command for each entry that you add
To delete the database agent or binding file, use the no ip dhcp snooping database interface configuration command. To reset the timeout or delay values, use the ip dhcp snooping database timeout seconds or the ip dhcp snooping database write-delay seconds global configuration command.To renew the database, use the renew ip dhcp snooping database privileged EXEC command.

Show ip dhcp bind

when i use show ip dhcp bind command on switch. the mac address is two bit more than normal.such as 0100.0039.2821.b1
what mean of b1 .how could this happen.
do you have some idea?

The first two numbers indicate the media type (01 represents Ethernet). The media type and the MAC address together form the client identifier which is what you are seeing. Please see the following link for confirmation.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guide09186a008008743b.html#23682
Hope this helps. If so, please rate the post.
Thanks,
Brandon

Dhcp binding shows same device twice

I am trying to assign a static IP to a radar on my network. The mac address is 0100.08de.0000.00
I have the following in the running config:
ip dhcp pool radar
host 10.1.30.176 255.255.255.0
hardware-address 0100.08de.0000.00
when i enter show ip dhcp binding
the mac address shows up twice on the list
10.1.30.106 0100.08de.0000.00   aug 29 2014 automatic
10.1.30.176 0100.08de.0000.00 infinite         Manual
It appears the radar is receiving a dhcp lease rather than the static address I want it to take. I can ping the radar on 10.1.30.106 not 10.1.30.176.
Why won't the radar accept the .176 ip?

Hi
The best way is to first use exclude command and then try client identifier. You can use the steps below:
ip dhcp excluded-address <ip address you are trying to get rid of the lease from>
then instead of hardware-address, try using client-identifier
ip dhcp pool STATIC
host 10.1.130.176 /24
Client-identifier xxxx.xxxx.xxxx
Do ipconfig /release then ipconfig /renew in command prompt and it will bind the IP to the computer's mac address. you can later do  "no ip dhcp excluded-address" to make sure the IP add held to the computer.
Or you can also try directly these commands:
ip dhcp pool STATIC
host 10.1.130.176 /24
Client-identifier xxxx.xxxx.xxxx
Thanks & Regards
Sandeep

Active DHCP Leases OID

Is there an OID to pull the active dhcp leases on a Cat3750 running c3750-ipbasek9-mz.122-46.SE.bin? We are running dhcp server in this switch on one of our remote sites and I would like to graph the data.
I looked online and there is a mib under .1.3.6.1.4.1.9.10. Which is the experimental brunch of Cisco. This MIB it is not supported on the IOS mentioned above.
Thanks for any info.
Jorge Jiles

You can use the following:
CISCO-DHCP-SNOOPING-MIB
http://tools.cisco.com/Support/SNMP/do/BrowseMIB.do?local=en&step=2&mibName=CISCO-DHCP-SNOOPING-MIB
1.3.6.1.4.1.9.9.380.1.4.1.1
The above requires that you enable dhcp snooping:
ip dhcp snooping
ip dhcp snooping vlan
From the cli, its the same as "sh ip dhcp snooping binding" output.
The CISCO-MAC-NOTIFICATION-MIB should get the dhcp based users info based on mac address, vlan, and ip address.
ciscoMacNotificationMIB
1.3.6.1.4.1.9.9.215
http://tools.cisco.com/Support/SNMP/do/BrowseMIB.do?local=en&step=2&mibName=CISCO-MAC-NOTIFICATION-MIB
Let me know if it works or not.

Static DHCP Binding

Hi Team,
I have a problem.
I need your assistance on creating manual binding on Cisco IOS v12.2.
I have more than 10 vlan with dhcp pools configured according to the vlans and their network range. There are several host that require manual dhcp mappings but, i'm failing to find a way to create a bind file for the manual entry.
please assist.
thanks,
elly

Hi Team,I have a problem.I need your assistance on creating manual binding on Cisco IOS v12.2.I
have more than 10 vlan with dhcp pools configured according to the
vlans and their network range. There are several host that require
manual dhcp mappings but, i'm failing to find a way to create a bind
file for the manual entry.please assist.thanks,elly
Hi Elly,
Check out the below link for DHCP static Mapping
http://www.cisco.com/en/US/docs/ios/12_3t/12_3t11/feature/guide/gtdhcpsm.html
Hope to Help !!
Ganesh.H
Remember to rate the helpful post

WLC "secret" and DHCP-3-BIND error

Gday Everyone,
Been getting this error a lot recently, but have not found much help. Any ideas,
*DHCP Client Task: : %DHCP-3-BIND_SRPORT_ERR: dhcp_support.c:376 Binding service port failed.
*apfProbeThread: : %LOG-3-Q_IND: passwd_store.c:470 Cannot retrieve secret from store -- integrity check failed.
*SNMPTask: : %SYSTEM-3-PASSWD_STORE_INTEGRITY_FAILED: passwd_store.c:470 Cannot retrieve secret from store -- integrity check failed.
*apfProbeThread:: %LOG-3-Q_IND: passwd_store.c:470 Cannot retrieve secret from store -- integrity check failed. [...It occurred 17 times.!]
Thank you,

I think the DHCP BIND is typically seen when you have the service-port set for DHCP and it isn't getting an address. Should be able to get rid of the error by configuring some out-of-band IP address on the service port.
The other errors however, I've never seen. I suggest you call TAC.
Is it just an error message you see in the logs, or does it appear to correlate to some noticeable symptom?

Auto clear ip dhcp conflict *?

Is there a command or config that will make a router automatically clear ip dhcp conflict * on a regular basis? I have a site that constantly has a problem with DHCP due to conflicts which is fixed simply by clearing the conflict table. If we could automate this, it would be great.

I modified your example to solve similar issue. I wanted it run every hour though. Here's how to modify Cron format:
https://en.wikipedia.org/wiki/Cron#Predefined_scheduling_definitions
My EEM simple script:
DV-CORE(config)#event manager applet ClearDHCP
DV-CORE(config-applet)#event timer cron cron-entry "0 * * * *"
DV-CORE(config-applet)#action 1.0 cli command "enable"
DV-CORE(config-applet)#action 2.0 cli command "clear ip dhcp conflict *"
DV-CORE(config-applet)#action 3.0 cli command "clear ip dhcp binding *"

Ip source guard feature and dhcp DHCP scope exhaustion (client spoofs other clients)

Hi everybody.
A dhcp server assigns ip adress based on mac address carried by client hardware field in dhcp packets.
One potential attack is when a rogue host mimics different mac addresses and causes dhcp server to assign the ip addresses until no ip address is left for legitimate host.
For e.g a host h1 with mac1 has assigned ip address by dhcp server as:
199.199.199.1 mac1
Dhcp server has the above entry in its database.
Using hacking tools such as Yersinia or Gobbler one can create a dhcp discover messages each time creating a different mac for client hardware field in dhcp server thereby causing a dhcp server to assign ip addresses because to dhcp server , these are legitimate dhcp discover messages with each carrying a different mac in client hardware addresses.
You might say use dhcp snooping and it will prevent that ( dhcp scope exhaustion) and configure the switch to check if src mac matches the client hardware address in dhcp message. But still we can creat spoofed discover messages where src mac in ethernet header will match the client hardware address in dhcp discover message. We still did not overcome the problem.
You might say use IP source guard feature but will it really prevent that problem from happening?
Let me illustrate it :
h1---------f1/1SW---------DHCP server
Let say we have configured dhcp snooping on sw1 and f1/1 is untrusted port. The switch has following dhcp binding
199.199.199.1    mac1   vlan1 f1/1
Next we configure ip source guard to validate both src mac and src ip against the dhcp bindings . When we configures ip source guard first , it will allow dhcp communication only so a host can request ip address and a dhcp binding can be built. After that ip source guard will validate src ip or src mac or both against the dhcp binding.depending upon how we configure ip source guard.
In our case we have configured ip source guard to validate both src mac and src ip against the dhcp binding.
A dhcp binding is already created as:
199.199.199.1 mac1 vlan 1 f1/1
Now using the hacking tools Yersinia or Gobbler on h1, we create our first spoofed dhcp discover message where src mac=mac2 in ethernet header and client harware address= mac2 in dhcp discover message. Since switch is configured with ip source guard feature and therefore allows dhcp discover message to pass through. Dhcp server upon receiving the dhcp message assigns another ip address from the pool. Now the dhcp server has following entries:
199.199.199.1 mac1
199.199.199.2 mac2.
We can continue to craft spoofed dhcp discover messages as mentioned above and have dhcp server keep assigning ip addresses until the whole pool is exhausted.
So my question is how does ip source guard in conjuction with dhcp snooping prevent this particular attack from happening? ( i.e DHCP scope exhaustion)
I really appreciate your input.
thanks and have a great week.

Thanks Karthikeyan.
First of all, we gather all the information about the locations of legitimate dhcp servers in our network. Once we have this information, we will configure the ports used to reach them as trusted. All the ports where end users will connect will be untrusted and therefore subject to dhcp snooping .
it means if any of user connected in that switch/vlan runs a dhcp services like vmware for eg. Snooping will prevent the dhcp/bootp servers connected to that port will not be able to process.
Yes that is correct. Because dhcp snooping feature will check these ports for the messages usually sent by dhcp server such as dhcp offer, etc. If the end user is running dhcp server using virtual machine, that port should be configured as trusted if it is dertermined that end user is running a legitimate dhcp server using vm ware.
When we have the dhcp snooping it prevents the 1st level of hacking itself. I don't think so it will have any impact on dhcp address releasing.
I am sorry. You lost me here. What is 1 level of hacking?
Dhcp snooping checks for dhcp messages such as dhcp release, dhcp decline.on untrusted port against the dhcp bindings.
Here is why;
h1---------SW1-------dhcp server
               |
             h2
Let say we don't have dhcp snooping in above attack and h2 is a legitimate user has already assigned ip address 199.199.199.2 by dhcp server. Thus the dhcp server has an entry:
199.199.199.2 mac2
Next we connect rogue user and it gets ip address 199.199.199.1 now the dhcp server has entries:
199.199.199. 1 mac1
199.199.199.2   mac2
Now using hacking tools, h1 create a fake dhcp release message with 199.199.199.199.2   mac2
Dhcp server upon receiving this message, will release the ip address and returns it to the pool.
By using DHCP snooping, switch will peer inside dhcp release message and checks against the binding. If there is conflict, it will drop the message.
IFor e.g
If have dhcp snooping configured , then switch will have adhcp binding as:
199.199.199.1    mac1    vlan 1   f1/1 lease time
199.199.199.2     mac2    vlan 2    f1/2 lease time.
If h1 tries to send fake dhcp release with ip address 199.199.199.2    mac2
Switch will check ip address 199.199.199.2 and mac2 against the binding related to f1/1 . Sw will find a conflict and therefore drops the dhcp release packet.
Thanks

WLC 5760 with internal DHCP server, clients no get IP address

Hi all,
I have 2 Cisco 5760 WLC (active-standby) IOS-Xe 03.03.03SE with one WLAN.
sh wlan summary
Number of WLANs: 1
WLAN Profile Name SSID VLAN Status
1 Invitados_ADSL Guest 905 UP
sh vlan
VLAN Name Status Ports
1 default active Te1/0/3, Te1/0/4, Te1/0/5, Te1/0/6, Te2/0/3
Te2/0/4, Te2/0/5, Te2/0/6
100 VLAN0100 active Te1/0/1, Te2/0/1
101 Planta_1 active
905 Internet active Te1/0/2, Te2/0/2
The DHCP server is internal.
Sometimes the clients no get IP address and the DHCP pool has IP addresses available.
The workaround done by me to solve the issue is “clear ip dhcp binding *”.
Some days later the problem appears again.
I see this bug with a similar problem:
NGWC blocks DHCP traffic if wireless broadcast disabled
CSCun88928
Description
Symptom:
Some clients set the BROADCAST flag on the DHCP Discover packet. This requires the DHCP server to reply with a broadcast.
In that case and if you are not using DHCP snooping on the 5760/3850, then the controller will block the return traffic unless you enable "wireless broadcast" which enables broadcast globally (and is thus not always desirable)
Conditions:
Seen on 3.3.2 IOS-XE
Workaround:
Use DHCP snooping with the "ip dhcp snooping wireless bootp-broadcast command"
OR
Enable "wireless broadcast" globally
My DHCP configuration is:
ip dhcp relay information trust-all
ip dhcp snooping vlan 905
ip dhcp snooping
ip dhcp excluded-address 172.16.0.1 172.16.0.19
ip dhcp excluded-address 172.16.1.250 172.16.1.254
ip dhcp pool Invitados
network 172.16.0.0 255.255.254.0
default-router 172.16.0.1
dns-server 212.66.160.2 212.49.128.65
lease 0 8
I see in Cisco documentation (http://www.cisco.com/en/US/docs/wireless/technology/5760_deploy/CT5760_Centralized_Configuration_eg.html) this configuration:
DHCP Snooping and Trust Configuration on CT5760
ip dhcp snooping vlan 100, 200
ip dhcp snooping wireless bootp-broadcast enable
ip dhcp snooping
interface TenGigabitEthernet1/0/1
description Connection to Core Switch
switchport trunk allowed vlan 100, 200
switchport mode trunk
ip dhcp relay information trusted ip dhcp snooping trust
interface Vlan100
description Client Vlan
ip dhcp relay information trusted
My question is,Do I have to add the command "ip dhcp snooping wireless bootp-broadcast enable" to solve the issue?
Thanks in advance.
Regards.
D

Yes, test it with the command you mentioned
ip dhcp snooping wireless bootp-broadcast enable
HTH
Rasika
**** Pls rate all useful responses *****

Clear ip dhcp bindings

"clear ip dhcp binding a.b.c.d-Clears an automatic address binding from the DHCP server database"
does this force the host to lose its IP
address and request a new ip via dhcp?

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Tabela normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:"Times New Roman";
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:"Times New Roman";
mso-bidi-theme-font:minor-bidi;}
Router# clear ip dhcp binding {address | *}
Deletes an automatic address binding from the DHCP database. Specifying the address argument clears the automatic binding for a specific (client) IP address, whereas specifying an asterisk (*) clears all automatic bindings.

DHCP server not reusing expired leases

Hi,
I'm using DHCP server on SF300 switches for assigning IPs to guest clients.
DHCP lease expiration time is set to 1h, start address is 192.168.1.11 and end address is 192.168.1.20.
SF300 switch assigns all 10 IP addresses to different clients until pool gets exhausted. After 1 hour all DHCP leases become expired and I can verify this on address binding page.
Problem is new clients are connected after let's say 2 hours and they can't get IP address from SF300 switch because pool is exhausted and switch don't delete/reuse expired DHCP leases.
Is there any way to force switch to reuse or delete obsolete DHCP leases so new clients would be able to get valid IP address?

Hello there,
You can use the command (in privileged EXEC) clear ip dhcp binding X.X.X.X or just an * (asterisk) but if you use just the asterisk instead of an specific ip addresses, ALL bindings will be cleared, including active ones.
Hope this helps.

Monitoring DHCP leases with SNMP

Hi,
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

Once I got my SNMP host to accept the correct attribute and configure the event trap all I had to do was add the trap command to the router. I then bounced one of my low usage PRI's (which had 0 calls on it ) and got the following event traps on the SNMP host:
Minor
May 19, 2010 2:21:00 PM EDT
A demandNbrLayer2Change notification has been received indicating that a D-channel on Rtr_Cisco device, named has layer 1 active but layer 2 not established. Interface Index = 83 Link Status = ISDNLinkInTransition
System
May 19, 2010 2:21:01 PM EDT
System
Major
May 19, 2010 2:20:59 PM EDT
A demandNbrLayer2Change notification has been received indicating that a D-channel on Rtr_Cisco device, named has both layers 1 and 2 inactive. Interface Index = 83 Link Status = ISDNLinkDown
System
May 19, 2010 2:21:00 PM EDT
System
It doesn't tell you specifically which interface is down but at least it narrows it down to the gateway/router. Most of our gateways have only one PRI anyway.
We use Spectrum One Click for network monitoring.
Here is L2 back on line:
May 19, 2010 2:21:01 PM EDT
A demandNbrLayer2Change notification has been received indicating that a D-channel on Rtr_Cisco device, named has layer 1 active and layer 2 established. Interface Index = 83 Link Status = ISDNLinkUp
System

Strange DHCP client identifier

I am troubleshooting DHCP between server and client (both Cisco IOS). I have discovered, that server sees client under completely nosensical client identification:
R1#sh ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
10.0.6.3 0063.6973.636f.2d30. Apr 01 2001 10:40 PM Automatic
3062.302e.6332.3838.
2e31.3637.312d.4661.
30
Yes, the client id server sees is "3062.302e.6332.3838.2e31.3637.312d.4661.30" instead of little more conventional "00b0.c288.1671". What's up here? This thing makes manual binding impossible, as that long number is not accepted in "client-identifier" on server.
Edit: No, I wasn't cut'n'pasting properly, that long client-id can be entered into pool configuration. So that solves the problem, and the only think that remains unanswered for me is what were Cisco thinking, when they decided that client-id is going to be this kind of crazy stuff instead of plain MAC.

Some Cisco networking devices use a DHCP client identifier format that is different from the format used by networking devices running Cisco IOS release 12.4(1) or newer.
Ref link: http://www.cisco.com/en/US/partner/products/ps6441/products_configuration_guide_chapter09186a008054afa2.html
But, you should be able to bind that full (long) address to the the client IP in your DHCP pool configuration and I've done that before. If you are having problems refer to this link:
http://www.cisco.com/en/US/partner/products/ps6350/products_configuration_guide_chapter09186a008054addc.html#wp1204466
HTH
Sundar

Resetting DHCP without sudo or admin password?

Not sure if this is the right place to post this query but I am trying to reset the DHCP lease automatically so I can create a little "logout" application in my internet café.
I've found the following commands that do the trick but they require the admin password:
sudo ipconfig set en0 BOOTP; sudo ipconfig set en0 DHCP
Any ideas on how this could be done without the admin password? What about with AppleScript?
Many thanks in advance,
Galen

No a hook is initiated by a launch daemon via launchd. So the shell script is being run by the system, not the user (admin or otherwise). ofcourse you would need to be an admin/sudoer to set it.
But why do you want to release the DHCP binding on logout? User processes shouldnt really be doing anything to change that to make it need to be released/renewed unless there is a wider network issue.

DHCP Binding oid

Similar Messages

Maybe you are looking for