Preventing A Computer With Static Ip From Joining Network?
Sep 28, 2012
prevent someone from putting their computer on a network with a static ip that is already on the network so it does not cause a conflict. I'll try to do the short version of what happeend (ip numbers wont be accurate) has his laptop with him set to a static ip of 192.168.0.1 and connects it to our network and our file server which is also the dhcp and dns is set to that ip address. So when he connected it it basically brought down our whole network....
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Dec 6, 2011
I have 3 computers on my network. The main computer is protected by mcafee. The other computers can not access the public folder on this computer. I know that the problem is the mcafee firewall because when i switch the firewall off the other computers have full access to this folder. This problem started with a mcafee upgrade. I want to keep the mcafee firewall,
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Nov 26, 2011
we already have an existing network tru a switch hub and other two pc access internet through a wireless router and this wireless router is connected to the switch hub together with the other pc our problem is we cant share files and folders to the other two pc using wireless..How can we share files to other two pc.
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Dec 14, 2011
We've just replaced some 1240 LAPs with 20 x 3502i.
Seem to have a problem, most of the 14 * 3502i have regersted on the network and working, 6 arent connecting and log below. I've replaced one of the AP with a differnt one, same model and batch and this works.
WISMs on 7.0.98.0
Scirpt
*Mar 1 00:15:16.015: %CAPWAP-5-CHANGED: CAPWAP changed state to
[Code].....
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Mar 15, 2013
I have two different locations, two different ISP�s .
Cable �Modem--------Linksys Router WRT54G
DSL-Modem----------Linksys Router WRT54GS
One computer (Windows 7 Laptop) which travels between both locations.Can I or how do I setup a static IP address for both locations on my computer and not have to change settings when I change locations?
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Jan 17, 2011
I got a static ip from my isp. I set up my static ip manually through my linksy router. I need the static ip to connect to a private network for my new job but cant connect to that network. I went to whatsmyip and found that my old dynamic ip is still showing up externally, it looks like my ip4 is using the dynamic as a preferred. My question is do i need to manually change the network connection on my LAN and wireless connection under ipv4 to change it from automatically obtain TO use the following address and put in my static? And do I have to change the DNS also? I am on a home network with one desktop on vista home premium and laptop windows 7.
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Aug 3, 2012
When I was hosting a server on minecraft, a few people complained that the server was down. It was, and the problem is that my router switched to a dynamic IP after comcast installed a security system to my house. If I try to reset the router, the system goes down and takes a helluva long time to get back up. Whenever I try to switch to a static IP, however, I lose internet connection. Wondering how to fix this. Or do I have to switch back to my laptop - which might also not even work. (I'll go try that, but I'm using my desktop because it has extra RAM.)
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Nov 10, 2011
Where internet connection strength is shown in main screen there is a yellow triangle with a black exclamation Mark in it covering the signal strength icon. I have tried contacting my Internet provider who could not fix. They have sent a new modem but still same issue on pc. I have several games consoles and also have an iPad and iPhone and Internet is working on these however my neighbour tried to use her laptop in my house and has the same issue.
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Oct 8, 2012
Home Group on Windows 7. I have added a room mate to my home group (just two of us in group). I don't want either of us to be able to view or share files, folders, etc. I think I've done everything on my end: turned off Network Discovery; turned off file and printer sharing; turned off Public Folder sharing. Also turned off automatic file/printer sharing in Norton firewall.
1) do I need to do anything else, and;
2) what does room mate have to do on his computer (if anything)?
I've spent quite a bit of time trying to figure this out on my own but somehow I don't feel quite sure that all my files/folders are not viewable by anyone else.
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Jun 11, 2011
I suspected her router... however I took it to my home to try it out on my router (whihc works fine on all our computers here).... and the same problem.. her computer says it's connecting.. accepts the WPA key etc.. but still no internet appears. when you hit diagnose on the failed window.. it says firewall or security settings are preventing acccess to internet!
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Sep 6, 2011
how we can prevent learners from creating files or folders on Drive C without restricting the users from running programs installed on the C drive. We dont want learners sending tests or answers of tasks to one another by copying it in drive C. We are running Windows Server 2003 Enterprise Edition.I know you got a plan for us
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Feb 1, 2011
I've been fighting with getting VPN connections working properly with my Dlink router. I set up virtual servers for PPTP and L2TP and could usually get the first attempt to work. Subsequent client connections would always fail.The logs display the following-Dropped GRE packet from 192.168.0.10 to 64.232.xxx.xxx as unable handle packet header. Blocked incoming GRE packet from 64.232.xxx.xxx to 76.105.xxx.xxx.What seemed to fix it was going to Firewall Settings and setting UDP Endpoint Filtering to Endpoint Independent and TCP Endpoint Filtering to Address Restricted.
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May 9, 2011
Is there any sort of "hardening-guide" re: preventing people from hacking the DIR-825? I've done the obvious (to me) things, but I'm wondering what the risk is.I'm also interested in how good the DIR-825 is, security-wise, compared with Linksys equivalent routers.Seeming limitations on the admin password has me concerned url...
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Aug 16, 2011
I've got an RVS4000 router with the latest firmware - V2.0.0.3, and just setup Dynamic DNS on it. However as I access the url of the Dynamic DNS, I get pointed to the routers web backend/GUI, which is natural as it's situated on port 80 of the router.
To prevent the whole interwebs from accessing my router's settings, I've quickly forwarded port 80 to a non-existent IP on my LAN. However this solution feels a bit fragile, so how can I ensure that only computers from inside my LAN can access the routers GUI?
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Feb 26, 2013
This is just a tip that we used on our controllers that I wanted to pass along. We were having issues with unwanted access points associating to our controllers. We had a stack of older 1242s that came up missing and hit our network. On way we came up with to prevent this was to number all of our wlans above I'd # 16 on the controller. By default the default ap group allows all wlans from 1 to 16. By starting with 17 we are not allowing any SSIDs in the default group. All if our production access points are in their own ap groups. Any access point that hits our controllers that has not been configured with the correct ap group name will be in the default ap group and will not be servicing any SSIDs.I know there are other ways to set this up but this was a tricky way for us to set it up and see who calls about there wireless not working.
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Apr 8, 2012
apparantly there is a bug in WAG160Nv2 firmware (version:V2.00.20 which is the latest). we had problem connecting to an outside smtp server using telnet. then out of frustration i reset the router to factory settings. then suddenly connecting to smtp server on port 25 was not a problem. then a few hours later, without doing any special changes to the settings, it's now again not possible to telnet to external server. apparantly something prevents outbound connections to port 25 to be established
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Apr 21, 2008
Is there a way to prevent resetting catalyst config by pressing and holding in the MODE button after powerup? I had entered in a basic config into my switch including passwords, etc. and was checking out different uses of the MODE button including setting the switch into express mode and I somehow managed to wipe the config and send the switch back into a default state by holding the mode button in for too long.
I want to prevent this from happening once the switch it is in production.
Not sure if it matters, but this is the 24 S model using the LAN lite image..
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Aug 28, 2012
I just got a new laptop, and for the most part have left its settings alone. Today I was trying to get some sharing going between my desktop and the laptop. Both machines are connected to the same wireless network and both machines consider that network to be a Home network. Both are running Win7 Home Premium. It seems like my laptop is aware of my desktop on the network. It can ping it by IP or by computer name. When I go to Network from the laptop, I can see the desktop in the list of computers. However, my desktop cannot ping the laptop, nor can it see it within Network. My desktop has a Homegroup set up, but my laptop says "There is currently no homegroup on the network". I do have network discovery turned on for both machines. Why can my desktop not "talk" to my laptop but it works the other way around?
Update: Disabling the Windows Firewall on the laptop somewhat fixes the problem. With it disabled, my desktop can ping my laptop, but still my laptop can't see the homegroup. Also, it can ping via hostname, which resolves to IPv6, but can't ping via the IPv4 address. Obviously I'd rather not leave my firewall disabled, so I need a more specific fix.
Update 2: Aha! It is the Cisco VPN software I was running to connect to work computers. Once I disconnected and exited from that, the two PCs seemed to be talking normally and the homegroup was visible to the laptop. So now my question has morphed: how can I prevent Cisco VPN from interrupting my home networking?
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May 13, 2010
I have the following setup:
R--H1
|
F
|
H2
R: 3840
F: ASA 5510
H: Hosts 1 and 2
I am trying to get SNMP info from the router to H2 but snmpwalk errors with no response from router. I can get info from H1 and neither interface on router is preventing SNMP traffic from coming or going.Is there something that needs to be configured to allow SNMP traffic (orginating from INSIDE) to reply? (Also note that there is no Inspect Maps blocking and SNMP versions).
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Nov 1, 2011
I have a remote site that is using port 4500 for within the isakmp phase of creating a IPSEC tunnel, but for some reason it is also using random port numbers constantly (in bold): [code] These are all blocked by the firewall when trying to communicate with our central router in the trusted network. The central router does not display the same symptoms, it only uses port 4500.Is there a way of preventing the remote router from using random port numbers and only allowed to use 4500??
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Jul 5, 2011
how to sending out the wireless network from computer A to computer B if we used a lan network to computer A
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Oct 17, 2012
We have a NETGEAR ProSafe™ 802.11g Wireless VPN Firewall FVG318 set up at work with a static IP so we can do a Voice Over IP from our sales office.Everything works fine until I plug in a computer that is connected to our digital printer, then the PC stays on the internet for a while, then crashes the connection.Once I plug in the PC to the network, the rest of the network has issues.
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Jun 9, 2011
I cannot join domain it saying that "Computer name changes", A domain controller for the domain MyDomain could not be contacted.”. We have domain and workgroup, Actually first its already joined the domain, but I want to map the sharedrive inside the workgroup but I cannot map. Then I change to join workgroup. After I boot up I cannot log in with that user, I log in with administrator and the user is dissappear in the "User Account", but the profile inside document and setting still left surprise. I don't know why Now I create one more user, it can map to share drive also share folder. also can see all other network computer. But only left one is I cannot join the domain. I need this one because of we don't let our user using as administrator account. Before I testing this one I should backup, but now the time
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Dec 21, 2010
I've just installed two ACS 5.2 appliances and I'm trying to get them to join my domain, I've setup an account that has the relevant permissions (tested the account on a laptop and it can join the machine to the domain).
The ACS keeps coming back with an invalid credentials to join the domain error despite the fact that I know the user in question has the correct permissions.
I have a suspicion that the problem is related to how the ACS handles the Active Directory Domain, we have a large domain that spans several domain controllers. The DNS server uses round robin DNS to serve a different DC's IP each time, however a typical windows laptop is aware of what controllers it's allowed to use whereas the ACS box doesn't appear to be.
The ACS servers are located in a network in the UK that is only allowed to talk to 2/6 DC's and I have no way of controlling what IP appears when the ACS tries to join the domain due to the round robin DNS.
Is there any way to get around this? Or any way to hard code a specific DC for the server to connect to? Even being able to add the DNS manually to a hosts file would work.
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Dec 3, 2011
I'm having problem joining a AP802 access-point in a Cisco 887VAM-W router to a WLC2125 running 7.0.116.0. I get the following messages pasted below from the AP console. The AP connects to the WLC over a EZVpn tunnel with a ASA on the other end, and can't see any error messages there. [code]
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Jul 1, 2012
Customer has got a 2 x 1552AP that wont join a WLC.
This is the debugs from the WLC. Customer cant console to AP to capture as its up in the roof so not easily accessible. why the AP wont join? Date/Time are fine on the WLC as is the region.
*spamReceiveTask: Jun 28 13:45:26.612: 2c:3f:38:be:23:c0 DTLS connection not found, creating new connection for 172:16:2:1 (57918) 172:16:0:1 (5246)
*spamReceiveTask: Jun 28 13:45:27.243: 2c:3f:38:be:23:c0 DTLS Session established server (172.16.0.1:5246), client (172.16.2.1:57918)
[Code]....
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May 12, 2012
There are a total of 25 Cisco 3502 APs installed. 24 APs were discovered except for 1 AP. I run SH CDP NE on the switch and the AP was discovered by the switch but it does not have an IP address. On the output of the SH CDP NE DE, I noticed that on the AP that is not joining, the Platform is "cisco AIR-SAP3502E-E-K9" while the APs that joined the WLC, the Platform is "cisco AIR-CAP3502E-E-K9". The software versions are also different but this could be because the WLC already upgraded the IOS when the APs joined.Why is the Platform "SAP3502E" for the AP that did not join.
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Apr 17, 2013
I had problems joining a 1131AG AP to a "new" 5508 WLC with 7.4.100.0 running. This AP has been connected to a, for me unknown controller for years. Now the customer wants to move this AP to a newer 5508 controller with 7.4.100.0 We [URL] could not get this AP to the controller connected. Now I have this AP on my desk. I have a 5508 (7.4.100.0) as well. I connected the AP to the same network as the WLC Management -> AP did not connect, tried to download the "new" IOS but didn't seem to work, same as already in the old tread. So I tried to login to the AP, but it seemed to have a for me unknown Account / Password.
-> I did a reset of the AP by pressing the mode button (about 2-3 sec.) during Power on (not connected to the network). Now I could log on to the AP. I deleted six crashinfos and connected the AP back to the network.
Now the AP joined the controller.
Does a "unknown" Password prevent the AP to join to a other WLC?
The AP hat 15740928 bytes total (6409728 bytes free) space on the Flash: was this enough for the new image? 15740928 bytes total (7798272 bytes free) after deleting the crashinfos
The customer has more AP's that has to join the new controller, would be nice that we don't have to reset all APs.
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Mar 19, 2012
After a wireless network interruption, one of MAP 1522 it's not joining to WLC .
(Cisco Controller) >show ap join stats detailed 00:08:30:bb:53:20
Discovery phase statistics
- Discovery requests received.............................. 7
- Successful discovery responses sent...................... 5
[Code]....
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Apr 8, 2013
For some reason some AP will not join the WLC. (WISMII)I have several hundrede AP online, but still a few offline
This fails:
FRH-R06-L226-UX-G#sh cdp nei gi2/0/41 detail
-------------------------
Device ID: AP5057.a8a1.c632
Entry address(es):
[Code]...
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Apr 3, 2013
recently migrated APs from a 4400 to 5508 which had the 7.4 code and encountered an issue that I haven't see before, in short the APs would never join the 5508 even when the selction rules said it should.The AP would get a discovery response from both controllers and even though the 4400 had 98 APs attached and the 5508 just 1 and a factory reset was made on the AP, it would always join the 4400.
A packet capture showed that the first CAPWAP address from the 5508 was always an IPv6 whilst the 4400 always sent IPv4 CAPWAP control adressess, disabling the global IPv6 option on the 5508 ensured that the the first CAPWAP control address was now an IPv4 and the AP then happily joined the controller, IPv6 addresses were still showing up in the discovery responses but since it was no longer the first one in the packet the AP didn't mind.
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Mar 28, 2013
I am working for a large campus network. The network has more than 70 VLANS in a Layer 3 Switch(Catalyst 4503). Customer wants to stop intervlan routing between all vlans except 2 vlans. How will i do that? I have also a Firewall (ASA 5520) & a Router (2811) in up of the switch. Besides this, I have run HSRP in Layer 3 Switches for redundancy.how will i stop intervlan routing between VLANS except 2, with ACL or any other process has?
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Apr 4, 2012
I've got a device that is not strictly speaking a 'desktop computer', but I communicate with it over the network - it's a video switcher, I use it for broadcasting.I'm trying to set it up with a static IP on my larger network, rather than just a local one, but in order to do that, it needs a static IP, and my network is setup with DHCP.I can assign it a static IP if I can get it's MAC Address - but there's the hitch.It's nowhere on the device itself, on the box, in the instructions.I ran "arp -a" in the console and found the IP it's currently assigned to, and the MAC address associated with that is:
7c:2e:d:0:68:ad
But that doesn't seem to be standard format. The :d: should have another character in with it, as should :0:
How can I convert this to standard format?
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