Cisco Switching/Routing :: 3725 - DNS Not Working After DHCP Server Config

Jan 24, 2013

I seem to be having a problem with DNS name resolution after configuring my router (Cisco 3725 running IOS image: c3725-adventerprisek9-mz.124-25.bin) for handling DHCP requests.
 
Before I made the change, everything was working correctly; I could ping Google.com from a computer inside my LAN and would get response from one of Google's public IP's like normal.
 
I had a separate DHCP/DNS server running Windows Server 2008 handling the DHCP request and DNS queries.
 
When I made the change, I turned off the DHCP/DNS server and issued the following DHCP commands to my router:
 
Code...

View 5 Replies


ADVERTISEMENT

Cisco Switching/Routing :: DHCP Client And Http Secure-server Config In C2950 Switch

May 7, 2013

I am trying to configure interface vlan1 to get an ip address from dhcp by entering the commnad ip address dhcp ios rejects the dhcp portion of my command as not recognised although it is referred to in Cisco manuals.my IOS version is c2950-i6k2l2q4-mz.121-22.EA14.bin.I get the same problem when I try to configure ip http secure-server on the switch. Is this a known bug or whether I have the correct IOS version for these commands?

View 6 Replies View Related

Cisco Switching/Routing :: 2600 Simple Router On A Stick Config Which Is Providing Dhcp To Customer SSID

Mar 17, 2013

i have a simple router on a stick config which is providing dhcp to a customer SSID.  however i don't want employees to stay on it and eat the band width since its open.  the lease is set to an hour, is there anyway that i could set it so that once your lease expired it can't be renewed for 4 about 8 hours?  I am using a cisco 2600 router in this setup.

View 1 Replies View Related

Cisco Switching/Routing :: 4506e Start-up Config Backup To Tftp Server

Mar 15, 2012

how can i take backup of startup config to tftp server through tftpd server.I am using 4506e switch

View 2 Replies View Related

Cisco Switching/Routing :: ASA 5505 Upload Config File Into Start-up Config

Apr 17, 2012

If i connected the latop to brand new out of the box ASA 5505 through consloe cable and i have a config file on this laptop from other ASA5505, is there anyway i can upload that config file into startup-config of this new ASA5505 through console cable, without using TFTP or FTP?

View 5 Replies View Related

Cisco Switching/Routing :: 3725 - Bridging Wired And Wireless?

Jan 30, 2012

Cisco 3725
IOS: (C3725-ADVENTERPRISEK9-M), Version 12.4(15)T9
Wireless Module NME
 
Brief current running config below:
 
interface FastEthernet0/0
description WAN LINK
bandwidth 8192

[Code].....

View 2 Replies View Related

Cisco Switching/Routing :: 3725 - Format CF Card On 1841

Dec 26, 2011

I have 3725 router with internal CF and external slot for CF. I tried upgrading and ended up deleting the iOS version on the internal flash, and can not now put the iOS back!! I turned it off.... so there was no active iOS..
 
I have tried formatting the CF card on an 1841 but the 3725 won't read it. It is obviously stuck at ROMMON
 
What is the correct way to format a CF card so my 3725 will read it and I can get an iOS back on it!!

View 1 Replies View Related

Cisco Switching/Routing :: HSRP Quirk On 3725 Router

Jun 4, 2012

I am setting up multiple vlan interfaces on a pair of HSRP Routers that will provide layer 3 routing for a network.  I am seeing this command sporadically show up in the router config mac-address-table static 0000.0c07.acd2 vlan 210
 
I am not entering this command.  So far, it has not shown up on the companion 3725 router.  I have a 2nd vlan I have just created and the problem hasn't shown up for that vlan as yet.Using C3725-ADVSECURITYK9-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3) on the routers.

View 4 Replies View Related

Cisco Switching/Routing :: 3725 SPAN Not Supported On Some Routed Interfaces?

Dec 12, 2012

I'm trying to configure a SPAN session on a Cisco 3725 router, but it won't let me complete the command. The router has two Fast Ethernet interfaces: 0/0 and 0/1. I'm trying to configure a SPAN session with Fa0/0 as the source interface and Fa0/1 as the destination interface. [code] But when I try to configure the session, it seems like it's giving me the option to configure the SPAN session, but in the end the router won't let me: [code] When I type "?", why would it give me the option of using the Fast Ethernet interface as source port, then when I try to execute the command, it doesn't like it?

View 7 Replies View Related

Cisco Switching/Routing :: 2600 DHCP From Service Provider Not Working

Feb 7, 2013

So I have  a 2600 that I have configured three sub interfaces on. FA0.0.1 is set for DHCP and supports VLAN 1. FA 0/0.2 for Voice, FA 0/0.3 for Data. I have this router interface plugged into FA 0/24 on my 3550 and the 3550 is configured as a dot1Q trunk (I have attached configs for RTR and SW).I have most ports configured as access VLAN 1 which is where i have my ISP connection plugged FA0/1 on the 3550. When I connect the service provider link FA0/0.1 never picks up an address. If I take my internal DHCP server and connect it to FA0/1 of the 3550 it snags an address almost immediately.In my mind this validates that my config is fine. I also took the same cable from the service provider cable modem and connected it to my laptop and the laptop is pulling DHCP.

View 4 Replies View Related

Cisco Switching/Routing :: P3750-E - Port Based DHCP IOS 15 Not Working

Apr 9, 2013

I am upgrading from 3750-E IOS 12.2 to 3750-X IOS 15.0
 
I have a dhcp pool set up to give out an ip address based on the Physical port of the switch.  I also have it configured to give out "reserved only" addresses.
 
The configuration works when i plug a dhcp device in the 3750E. (IOS12.2) The configuration does not work when i use the same config on 3750X (IOS15)                  
 
When i debug dhcp, i see the DHCP discover message come in, but no offers or anykind of response from the 3750X.
 
If i remove the "reserved only" line the switch gives out IPs, but of ocurse not the ones i want.  I did that to prove both the client and the switch can give out an IP.
 
So i have a feeling the subscriber-id client-id interface name  mapping is not right, or not created.
 
Here is a snippet of config.
 
!
no ip dhcp use vrf connected
ip dhcp use subscriber-id client-id
ip dhcp subscriber-id interface-name

[Code]......

View 1 Replies View Related

Cisco Switching/Routing :: 1941W No IP From DHCP Server With Ip-helper

Jun 12, 2013

I've a Cisco 1941W router which is DHCP server for data-VLANs and uses ip-helper for voice-VLANs. [code] I don't know why I can't have IP from wireless voice VLAN whereas it is OK and wired voice VLAN and conf is the same!

View 4 Replies View Related

Cisco Switching/Routing :: Configure 881 Router To Act As DHCP Server?

Jul 9, 2012

Is it possible to configure an 881 router to act as a DHCP server to 4 VLAN's each with a different scopes all through a single ethernet interface? 

View 2 Replies View Related

Cisco Switching/Routing :: DHCP Server Catalyst 3750

May 28, 2013

I have customer who has as Core Switch one Cisco Catalyst 3750 with the IOS c3750-ipbase-mz.122-35.SE5.I know that this image support DHCP Server configuration, but I like to implementate new vlans (approx 15) and I want to know if this switch support 15 DHCP Servers.

View 3 Replies View Related

Cisco Switching/Routing :: 861 Need DHCP Server With Static IP Addresses

Feb 2, 2013

I used to use a CentOS self-made server for intranet for my little office, but I bouth few days ago a Cisco 861 router to replace the linux box.
 
1. I have 2 public IP classes from my ISP. 1 class is limitted to 80mbit upload, the other to 30mbit upload. So I need some sort of DNAT to be able to know exactly which intranet computer uses big internet and which one limitted internet.
2. I need DHCP server and with static IP addresses (one computer must always have the same IP address, etc).. i have my needs for this.
3. Also I need external access to some servers inside (web, ftp, etc) [code]
 
So far so good, all looks simple and I can achieve this in 2 hours on a centos linux box (correct routes, ip forwarding enabled and few iptables rules for NAT/SNAT/DNAT).
 
But on this brand new Centos router well, i'm not even successful in pinging the outside world, nor the inside world I'm tired of reading the forums, the documentation..i want (at first) a simple scenario: vlan+dhcp, fa4 with 1 public ip address and ACCESS to the real world. I wasn't able to achieve not even that much. [code]

View 6 Replies View Related

Cisco Switching/Routing :: Possible To Set NTP Server Via DHCP On 2901 Router

May 2, 2012

i'm interested if it's possible to set the NTP server via DHCP on an 2901 Router with 15.2(2) image.
 
i configured the interface gigabit 0/0 as dhcp client. The DHCP Server sends to me DNS, Default GW and NTP. All is working fine, but the NTP will not be configured. i tried to add an DHCP option request, but there is no NTP (42) value. [code]

is there any way to add the value NTP (42) for the DHCP request or isnt it possible?            

View 4 Replies View Related

Cisco Switching/Routing :: 892 Interfere With Windows DHCP Server

Mar 27, 2012

I have trouble with a Cisco 892 Router from my Internet service provider.
 
Last week we switched from a virtual Router to a hardware Router. But after plugging it in our LAN Switch, the Windows DHCP Server stopped leasing IP's. I got many BAD_ADDRESS with MAC like e1:80:10:ac, e2:80:10:ac, e3:80:10:ac, e4:80:10:ac, e5:80:10:ac, ea:80:10:ac, eb:80:10:ac, ec:80:10:ac and so on.
 
I do not have access to the Router config, so I can not dump the config to you. We have a flat LAN, single SUB-Net(172.16.0.0/16) and no VLAN, no Spanning Tree. A Keep it Simple, Stupid(KISS) System.
 
A tech guy from service provider, is telling us, the error is not there fault and my switch is not correctly configured. But this is ********. For years we had a another Cisco Router from the precursor ISP and for 2 years the virtual Router from our current ISP. No trouble with my DHCP. But after plugging the new Router in, my DHCP stopped working.On the 892 is no running DHCP, but something interferences with my Windows Server 2008 R2 SP1 DHCP Server.

View 15 Replies View Related

Cisco Switching/Routing :: How To Let Nexus 5548UP Act As DHCP Server

Nov 14, 2011

it's possible to let the Nexus 5548UP act as a DHCP server? (or if it will be possible in future releases)

View 3 Replies View Related

Cisco Switching/Routing :: 3725 Multiservice Router Maximum Flash Memory?

Jan 24, 2012

I read that there are internal and external flash memory in 3725 router that can max up to 128mb. So adding the sizes of internal and external flash memory, will that total to 256mb?
 
And also is the internal flash of 3725 just the same with its external flash?

View 8 Replies View Related

Cisco Switching/Routing :: Cannot Find Port Number From MAC Address Using SNMP With 3725

Dec 2, 2012

I'm developing a project where I use the SNMP protocol to discover the network. By discovering the network I mean go through all the routers and switches and retrieve the IP routing table from routers and the forwarding table from switches. With the routers I have no problem. For the switches I need to know for each port the MAC addresses and the Vlans. Basically it's use SNMP to find a port number from a MAC address. To do that i followed this tutorial: [URL]
 
The problem is that I'm using a Cisco 3725 Router with IOS 12.4 (21) and a NM-16ESW module to work as a Switch and when I use the OID .1.3.6.1.2.1.17 corresponding to the BRIDGE-MIB as it follows:
 
snmpwalk -v2c -c myrouter 10.1.1.5 .1.3.6.1.2.1.17
 
it returns: 
SNMPv2-SMI::mib-2.17.1.1.0 = Hex-STRING: 00 00 00 00 00 00
SNMPv2-SMI::mib-2.17.1.2.0 = INTEGER: 0
SNMPv2-SMI::mib-2.17.1.3.0 = INTEGER: 4
 
From this I guess there's no information on the router about Vlans or anything. Other thing is that when I use community string indexing it returns a timeout. My theory is that this version doesn't support indexing but I don't know.
 
how can I get the Port Number from a MAC address from this "switch" (it's a router working as a switch) using SNMP?

View 2 Replies View Related

Cisco Switching/Routing :: 3750v2 DHCP Snooping Not Working Dropping Packets

Jan 9, 2013

I recently installed DHCP snooping on a 3750v2 switch (Version 12.2(55)SE4) and configured the uplink(Po2) as a trusted port. The problem is that clients cannot receive an IP address. When I disable DHCP snooping it is working properly. DHCP snooping is configured correctly but I don't have an idea how to resolve it. [code]I tested the solution on the same kind of hardware switch and firmware and it worked out fine. What is causing the clients not to receive an IP address from the DHCP server?

View 10 Replies View Related

Cisco Switching/Routing :: 891 Router DHCP Server Reservations Being Overridden?

Dec 11, 2012

I am running into a DHCP problem on a Cisco 891 running 15.0(1)M2.  I am running DHCP on the router and want to reserve an address for a printer.  I have done this hundreds of times on hundreds of routers.  Per Cisco recommendation, I let the printer lease an address to see whether it uses it's "hardware-address" or "client-id".  This printer uses the "hardware-address" format.  The printer has leased 10.0.0.102 right off the bat.  I want it at 10.0.0.50.
 
I have a DHCP pool, like this:
 
ip dhcp pool CLIENT
   network 10.0.0.0 255.255.255.0
   domain-name chsinc.ds
   default-router 10.0.0.1
   dns-server 10.0.0.1
   lease 2
 
I create a "reservation" like so:
 
ip dhcp pool HP_LaserJet_Printer
   host 10.0.0.50 255.255.255.0
   hardware abcd.ef12.3456
 
Now I do a "show running-config" to see what I've put in and it looks just like above.  Now we reset the network settings or change any network setting on the printer to force it to renew it's lease.  What should happen and what usually happens is that the printer should request an IP, be offered 10.0.0.50, accept that IP and come up on that IP address.  What is happening with this particular printer is that the printer requests a specific IP (the same IP that it had initially = 10.0.0.102), the router says OK and does not enforce the reservation.  Then the router actually deletes the hardware-address config line right out of the running config.  A "show running-config" shows that the reservation config now looks like this:
 
ip dhcp pool HP_LaserJet_Printer
   host 10.0.0.50 255.255.255.0
 
See the logs below.  Notice the ones in bold.
 
000226: Dec 12 17:34:01.382: DHCPD: Seeing if there is an internally specified pool class:
000227: Dec 12 17:34:01.382:   DHCPD: htype 1 chaddr 101f.74b0.575c
000228: Dec 12 17:34:01.382:   DHCPD: remote id 020a00000ae1e10100000001
000229: Dec 12 17:34:01.382:   DHCPD: circuit id 00000000

[code]....

Is there a way to make the router enforce the reservation and not let clients just bring their own IP and actually make changes to the running-config of the router?

View 6 Replies View Related

Cisco Switching/Routing :: Configuring DHCP Server On WS-C2960S-24PS-L

Jun 5, 2013

I receive a question from a future customer about this future if its supported on " WS-C2960S-24PS-L":configuring 2 dhcp server on this swith ( 1 dhcp for voice vlan , and 1 for Data Vlan).I did some search , but i didnt find the answer .i have to advice a customer before ordering the switch.

View 2 Replies View Related

Cisco Switching/Routing :: 4500 DHCP Server On Access Port

Apr 24, 2011

On a 4500 switch port , defined as access vlan 10, if the user connects his own dhcp server ( instead of the normal pc that should be connected ), will it cause issues with my existing network. the existing network is all static ip. In above case, will the dhcp server start looking out and assign dhcp ip's , if a user unknowingly removes his static ip and changes to obtain ip via dhcp option on the lan properties.

View 10 Replies View Related

Cisco Switching/Routing :: Catalyst 3560-X Switch To Act As DHCP Server

Apr 26, 2012

I'm attempting to configure a Catalyst 3560-X Switch to act as a DHCP Server. There is documentation that supports this feature. Below is my config procedure however after the completed procedue no IPs are handed out to clients. [code]

View 1 Replies View Related

Cisco Switching/Routing :: Nexus 7018 Support Dhcp Server?

Oct 26, 2011

Can I configure a DHCP Servero on the Nexus 7018?

View 2 Replies View Related

Cisco Switching/Routing :: 2960 With LAN Lite Software Be DHCP Server?

Feb 10, 2013

I need to  buy a cheap Cisco switch with DHCP server.Can you confirm that 2960-24-S, 2960-24TC-S and 2960-48TC-S be a DHCP server?

View 3 Replies View Related

Cisco Switching/Routing :: 3750X / DHCP Server Not Handing Out Specific IPs

Apr 17, 2013

I have a DHCP server for a subnet that has only lightweight WAP's in it.  The DHCP server is running on the gateway for this subnet which is a 3750X 2 switch stack running 12.2(53r)se2.I have the following configured:

ip dhcp excluded-address 10.1.10.161 10.1.10.162
 ip dhcp pool DHCP-VL20
network 10.1.10.160 255.255.255.224
domain-name mydomain.net
dns-server 10.11.11.30 10.11.11.40
default-router 10.1.10.161
ease 3
  
The server hands out up to 18 IP addresses and no more, with 20 devices on the subnet.  Scanning the subnet with a 3rd party network management system I see the following IP's never get handed out or used:
 
10.1.10.161 - 162 (manually excluded)
10.1.10.167 - 168
10.1.10.171 - 176
10.1.10.178
 
and of course  2 IP's I have manually excluded, 11 IP's in all that wont get handed out.  It should only be 2 that don't get handed out.  I've double and triple checked the exclusion and thats the only one.  so I run a 'sh ip dhcp pool' and see this:
 
Pool DHCP-VL20 :
Utilization mark (high/low)    : 100 / 0
Subnet size (first/next)       : 0 / 0
Total addresses                : 30

[code]....
 
[edit]I should also mention that "sh ip dhcp bind" does not show these randomly excluded IP's in use.  They also do not show up in any arp table I can find.I have looked all over the config and I cant find where these extra 9 addresses are being excluded. how to free up these 9 seemingly random exclusions?  Haven't issued a reload and I haven't deleted and rebuilt the DHCP server yet, production network.

View 2 Replies View Related

Cisco Switching/Routing :: 2950 - DHCP Server With Command To Enable It

May 4, 2012

I am wondering if it has its own DHCP router and if theres a command to enable it?Also Random side question. it hands out ip addresses to other devices (the 2950 im using infront of a router) but when I hook up another switch to this switch it doesnt initialize the port or try to connect? why.

View 1 Replies View Related

Cisco Switching/Routing :: 4500 - Dhcp Server On Access Port

Dec 24, 2011

On a 4500 switch port , defined as access vlan 10, if the user connects his own dhcp server ( instead of the normal pc that should be connected ), will it cause issues with my existing network. the existing network is all static ip. In above case, will the dhcp server start looking out and assign dhcp ip's , if a user unknowingly removes his static ip and changes to obtain ip via dhcp option on the lan properties.

View 1 Replies View Related

Cisco Switching/Routing :: C3560 DHCP Server For Nortel IP Phones

Oct 7, 2012

I just trying to setup a dhcp server in my catalyst 3560 switch for a nortel ip phones. I show you mmy configuration:

VOICE VLAN: 3
DATA VLAN: 1

S1:10.2.110.200
port:4100
Nortel IP Phones: IP 2002 (Firmware Version 0604D9H) & IP 1110 (Firmware Version 0623C7)

Switch Configuration:
aaa new-model!aaa session-id commonip subnet-zeroip routing!ip dhcp pool datos network 10.2.100.0 255.255.255.0 default-router 10.2.100.1 lease 0 2!ip dhcp pool voice network 10.2.110.0 255.255.255.0 default-router 10.2.110.200 option 191 ascii "VLAN-A:3" option 128 ascii "Nortel-i2004-A,10.2.100.200:4100,1,5." lease 0 2!!!!no file verify autospanning-tree mode pvstspanning-tree extend system-id!vlan internal allocation policy
[Code]...

View 2 Replies View Related

Cisco Switching/Routing :: 3750 - DHCP Server Doesn't Provide IP Address

Dec 11, 2012

a new LAN installation, two VSS pair 6509 core, 15 closets, with 3750 stacks. Floor 15 only, devices/hosts can ping teh DHCP server but cannot aquire IP addresses. no such problem on other floors?
 
portfast an dother parameters are intact.

View 2 Replies View Related

Cisco Switching/Routing :: DHCP Server Will Work On 2950 / 2960 Switch

Feb 11, 2012

With out using any server, will DHCP be configured in cisco 2950/2960 switch?I man cisco it self should work as a dhcp server also.

View 10 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved