Cisco Switching/Routing :: Using 1751 Router As NTP Server?
Jun 2, 2008
about three months ago I set our 1751 router as the NTP server of our domain for both our AVVID phone system and our Microsoft Active Directory domain. Been working excellent up until last night. Our company's building had a power cycle and the router got rebooted. Not a huge issue, since it's actually been rebooted a couple of times since becoming the ntp server.
After it's reboot, the time somehow jumped ahead an hour according to all the devices that sync with it. Phone calls stopped working and Active Directory pretty much became useless.
I finally had to break all the devices off of syncing with the router and set them back to the way they were (phone servers sync with each other, active directory doesn't sync with anything externally). It took a few hours to get everything stable again, and I'm still working on parts this morning.
Here's what I've had setup now for three months, we're in Central Standard Time:
ntp clock-period 17179971
ntp master
ntp server 69.26.112.120
and I set the "clock timezone CDT -6" It's been like that for three months and everything was fine till last night when it went out of wack.
it's possible to use the Cisco 1751 router without any add WIC , just use the build in Ethernet port behind Linksys or other ADSL router given from ISP, and configure the Cisco 1751 to make and handiling the VPN traffic ?if yes , how can I configure the Ethernet0/0 port ?
I do not have a cross over cable and have to use xmodem. I set the baud rate to 115200 and I can see everything fine. Using Tera Term when you send the file via xmodem it freezes and closes on packet #3 or about 384 bits. When simply clicking the send file button you get the error-
Not sure what to do from here. I have tried everything.Error you get when you boot the router:
System Bootstrap, Version 12.2(1r)XE1, RELEASE SOFTWARE (fc1) TAC Support: [URL] Copyright (c) 2001 by cisco Systems, Inc. C1700 platform with 32768 Kbytes of main memory loadprog: bad file magic number: 0x0 boot: cannot load "flash:"
I am currently using a Cisco 1751 w/ 1-WIC-DUS-T1 to connect our branch locations via Frame Relay. I will be adding 2 new locations in about 2 months. What is the 1800 series match for the router I currently use and is there and performance advantages?
I have a Cisco 1751 that I wanted to use to create another network behind my Actiontec m1424wr Verizon router. My plan was to connect a linksys wrt54gs to the Cisco router for device connectivity. And I wanted everyone else in the house to still be able to use the Verizon router as expected. I know this is probably not the best way to create an internal network. But I am studying for the CCNA & CEH and just wanted to use the Outdated Cisco IOS on the 1751.
I have Cisco 871 acting as a VPN server behind another router in the same LAN. The problem is that I can't connect to the VPN from outside network using the public IP but I CAN connect to the VPN from inside the LAN using the internal IP. I've assigned a virtual server on the main router to forward the traffic (port 1723 and 47) to the VPN router but still doesn't work.
I would like to setup RDP on my cisco router so I can access my server from outside my network. I also have a router from my ISP that has DHCP for my external IP address and DHCP for my internal as well.
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?
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?
I have a 3911 router with a 1242 AP. The problem that I have is that when the user is trying to connect, the user get the OS Ip address 169.254.168.154 and I see that when I do the "show dot11 association" command, but when I do sh ip dhcp binding on the router I see
172.19.9.141 0100.18de.74db.14 Jan 31 2011 11:14 AM Automatic
The router is seeing as if the router gave the ip address to the user, but the reality the user was assigne the OS ip address 169. I did "debug ip dhcp server events" and I got the following:
Jan 31 11:09:06.752 EST: DHCPD: Seeing if there is an internally specified pool class:Jan 31 11:09:06.756 EST: DHCPD: htype 1 chaddr 0100.18de.74db.14 Jan 31 11:09:06.756 EST: DHCPD: remote id 020a00000a58218400000000Jan 31
I'm trying to view the logs from a Cisco 857W router to a workstation running the Kiwi Syslog server. what I've done is the following:
Config term
Logging on
Logging source-interface BVI1
Logging Facility Local7 (or any other facility you want to allocate for this router.)
Logging [IP Address or Hostname of machine running Kiwi Syslog Server]
End
I see noting on the syslog server. Although I can see the log information on the router Also is there a command to stop the logging from generating or is this on by default.
I have configured cisco 1751 router for internet with nating. Internet browsing working fine. But We have polycom hdx 6000 conference system to connect from remote site.
1. While calling remote ip it is ringing and connecting but not displaying any thing on the screen but their side is displaying. 2. When they call our side ip it cannot connecting.
I have connected netgear router then video conference is working fine (with out port forwarding also). If I configured that router between 2 local sites (not on internet line) its working fine where i did not configured any thing just given routing. Configure same situation using internet leased line.
I am using Solawinds syslog and trying to get our Cisco routers send syslogs to our syslog server. I followed the procedure on Configuring Cisco Devices to Use a Syslog Server from [URL] Our Cisco swtches are all sending syslog messages but not the routers. I compared the config with our access switches but can't seem to find the problem:
I have a single DL 380 G5 server with 2 NIC , i have 2 applications which run on 2 separate WAN static ip addresses my query is that can i install both the applications on a single server ? secondly can i assign 2 different WAN static ips on the 2 NIC of the same server ? if yes then how it will be done i.e whether gateway will be given to both the NIC or only a single one
Cisco 851 router Apple Ipad 3 using IPSEC setp get this message The VPN server did not respond. I have tried Anyconnect that gives me Cannot verify server identity anyconnect can't verify the identity of ios-self-signed-certificate-1164042433 would you like to continue anyway? hit continue and it just goes off. I was asking if If get an ASA 5505 to replace my 851 it would work in my environment.
I have 15 computers accessing the web thru the 851. I host a web site on one of my servers. I have a static ip address. I also host exchange server and have remote web access to my exchange as well as remote outlook users. I can VPN thru the 851 using the cisco client on Windows 7 and vista and even xp. Would like to use the native windows client and get my iphones and ipads working. Can the ASA5505 support the above? Was also looking at the cisco 1841 how about that one?
i have server with two uplink to pair of 6500 non-VSS, this server member of vlan 100 sw-1 is active HSRP while sw2 is a standby HSRP , how can i make this server forward traffic on both Link . the server admin told me only one link is active (green) on the server while the other link is orange
I have 2 routers, one is an Apple AirPort Extreme with a static outside IP address, I also have a Cisco 871 with a static outside IP address. The Airport Extreme connects to a switch on the private network and has an IP address ending in .1. The Cisco 871 connects to the same Private network and it ends in .2. The 871 is setup as a VPN Server. now when clients connect to the VPN they can ping the VLan IP Address on the 871, but they can t ping any other hosts on the smae network. The hosts on the private network can ping the vlan on the 871.
I was so fed up of using the out of a box routers from PC World or the provided router from the host that I decided to splash out and buy a decent router.The Cisco 887 came highly recommended and seems to be a great purchase so far. Our down time and internet hangs vanished overnight.Having had this installed for several weeks now I thought it was time to look at my problems with it,I have 2 broadcom network cards, 1 for the LAN and 1 for the WAN, All machines connected to the LAN get full internet access but my server will not.
The router plugs directly into the Server (2008) with an IP address of 10.10.10.1 - this is listed under the LAN settings in Cisco CP Express.I have a fixed IP address which appears to be set up correctly and all my terminals / client pc's that are plugged through the switch. These all show IP's that look like 192.168.1.x / I am not an IT wizz kid but I know my way around a computer pretty well. I am guessing I need to move the router IP to within range. At present the Server sorts out the DHCP and we also have a VOIP phone system.
On our ISA server we have some publishing rules with the option "Requests appear to come from the ISA Server computer". This allows us to forward incoming external traffic to a network that is not directly connected to the ISA Server internal interface. We need this because our internal server does not know the route to the internet client but does know the route to our ISA Server, so the internal server sends his response to the ISA server and he sends it to the internet client.
I have a contained environment where I just want my servers all to have the same time. I want them to pull that time from my 3750. What do I have to enable on the 3750 to be the NTP clock source.
Keep in mind that the 3750 will not be getting the source from anywhere else, just my "set clock" command.
We have a bit of a problem when deploying VTP v3 in our network. When command vtp primary vlan is issued, switch typically send query to appropriate multicast address in order to find out whether there is already some other one. The problem we are experiencing is that old primary server is not discovered, because it fails to reply on those multicasts.
This debug messages (from the old primary server )may be more describing.
How do i go about setting up a TFTP server from laptop to Cisco ws-C3750 48P Switch, I need to pull the image off the switch and place it on an other switch that has a corrupt image, The switch which is corrupted is the same as above Cisco ws-C3750 48P.
I have a 6506-E with 720 Sup. I am trying to connect a server with HP 550SFP Nic to my 6506.If I plug the SFP from my server into my 6506 it will not link. When I plug that very same SFP into a 3750 it links fine. Makes me think that there is something I am doing worng on the 6506 Config.But, If I plug another server using a IBM LAN Card into the same port on my 6506 it connects and works fine so now I am starting to wonder.
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!
I'm due to replace a stack of 2 x 3750 switches very soon with 2 x 3750Gs. These 2 current switches are the VTP server for a small domain. I have put the config on the new switches switches and I made it a server and used the same VTP domain and password etc and got the VLAN info ported over.Now I did this a while back and noticed the switches are in transparent mode with a revision number of 0, I need to set this back to server and swap the switches out but the revision will be lower than the client switches (around rev 200), what do I need to do?
I am trying to connect my Access Server to my main network via the AUI port and I am not able to ping any device..
Current Config:
Access_Server#show run Building configuration... Current configuration : 1113 bytes ! version 12.3 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption
This isn't a big deal as the rest of the ACL works fine, but this is an annoynace since the web auth redirects to our company website (internal for now) after successful login.We have a Cisco WLC that provides access to our production and guest wireless environments. The guest environment of course is in a separate vlan (10.10.50.0/24). So I created this ACL:
access-list 107 permit udp any host 10.10.2.13 eq bootpc <----internal DHCP server access-list 107 permit udp any host 10.10.2.13 eq bootps access-list 107 deny ip any 10.10.0.0 0.0.255.255 <---all internal networks access-list 107 deny ip any 172.28.16.0 0.0.0.255 <----DR Network access-list 107 permit ip any any int vlan 50 Desc "Guest wireless network" ip access-group 107 in
This ACL basically gives the wireless guests access to an internal DHCP server and full access to the internet. For the 10.10.50.0/24 scope, the DHCP server assigns Internet DNS servers and my rationale is that wireless clients would access it via the external IP address but I suppose it doesn't work quite like that with the website being behind the same router as the client machines.
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.
In the following scenario, how will the 2950/2960/2960S series behave:
- VTP server/domain configured on a 6509 - A access switch (2960) currently configured in transparent mode with all VLAN it requires
Will the switch drop any traffick if we change it from transparent to client mode if the VTP server has the exact same vlans defined as the access switch had when it was in transparent mode?
The setup I currently have is a server attached via an etherchannel to a 3560x switch, which is connected to a pair of 5548UP's that are connected via vpc. The 5548's both have a single connection to 6500 series switch that does the layer 3 routing, the ports that connect the 5548 to the 6504 are trunk ports. The problem that I am having is that one of the 5548's can ping the server that is connected down stream while the other 5548 can't. While the local switch can ping the server, and other servers on the same switch in the same vlan can ping it as well. The vlan interface I am pinging from on each switch is on the same subnet as the server I am trying to ping. One other thing, Nexus #1 which can ping the sever has the mac address in its mac address table, while Nexus #2 doesn't. However I added the static mac entry to Nexus #2 and that did not allow me ping either.
We're attempting to SSH from a Cisco 2960S to an SRX240, and are having some issues. The error we're seeing on the switch is: ops-switch1#ssh -l root 10.10.10.1. Any way to work around this on either the server or client side?
