Dual DHCP Or Access Devices On Different Subnet?
Aug 23, 2011
I have a problem with my 2 networks which are 1000 meters apart.One is my HOME the other is my CARAVAN SITE. both networks are working fine independently, the problem occurs when i join the networks together.I need to connect the said networks together in order to view my IP cameras which are dotted all around the campsite, i need to be able to view these from HOME.The problems i am having is DHCP servers are stealing clients from the other sides and directing them to the wrong gateway.please see below network map (these routers are all running DDWRTBelow is another network map which someone on another forum told me to do but its still not working. (DHCP servers are still clashing and still stealing clients)y the way, on both of the network maps all routers are connected with the LAN interface. someone told me to connect certain routers with WAN and it didn't work, or it was not explained correctly.Also please note that assigning clients with Static IP's is completely out of the question due to most of the clients being campers who come and go
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Aug 23, 2011
One is my HOME the other is my CARAVAN SITE. both networks are working fine independently, the problem occurs when i join the networks togetherI need to connect the said networks together in order to view my IP cameras which are dotted all around the campsite, i need to be able to view these from HOME.The problems i am having is DHCP servers are stealing clients from the other sides and directing them to the wrong gateway.please see below network map (these routers are all running DDWRT)Below is another network map which someone on another forum told me to do but its still not working. (DHCP servers are still clashing and still stealing clients)by the way, on both of the network maps all routers are connected with the LAN interface. someone told me to connect certain routers with WAN and it didn't work, or it was not explained correctly.Also please note that assigning clients with Static IP's is completely out of the question due to most of the clients being campers who come and go.
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Aug 23, 2011
I have a problem with my 2 networks which are 1000 meters apart.One is my HOME the other is my CARAVAN SITE. both networks are working fine independently, the problem occurs when i join the networks together.I need to connect the said networks together in order to view my IP cameras which are dotted all around the campsite, i need to be able to view these from HOME.The problems i am having is DHCP servers are stealing clients from the other sides and directing them to the wrong gateway.please see below network map (these routers are all running DDWRT)if(GetCookie('computingnet_image') == 'yes') { document.write(''); }Below is another network map which someone on another forum told me to do but its still not working(DHCP servers are still clashing and still stealing clients)by the way, on both of the network maps all routers are connected with the LAN interface.someone told me to connect certain routers with WAN and it didn't work, or it was not explained correctly.Also please note that assigning clients with Static IP's is completely out of the question due to most of the clients being campers who come and go.
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Mar 7, 2013
I'm currently taking a networking course and was having some difficulty answering the following questions and could use a little clarification.Question: When pinging a non-existent device on your subnet, why doesn't the source node issue a ICMP echo request.My thoughts on this was because there was not a receiving node therefore any ICMP packets were not issued.Question 2: when pinging another non-existent device but not on your subnet, why doesn't the source node issue a ICMP echo request.
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Sep 9, 2012
I have a Netgear modem/router [DGN1000] (192.168.0.x) that serves as a the router for network 1 and also as the internet gateway. I have a Cisco [E4200] (192.168.1.x) router connected to the Netgear modem via the WAN port on the Cisco. This serves as the router for network 2.
DHCP is turned on for both routers. I can access all devices on network 1 using any device o network 2 including the Netgear modem configuration page, but I cant access any device on network 2 from network 1. Is it possible to have access to devices from both networks? [URL]
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Feb 14, 2012
I have a Linksys WAG120N Wireless-N ADSL2+ Modem Router. The firmware version is V1.00.12.I run a Windows machine attached to the router which has a certain sub network address. On that same machine I run a Virtual Machine with Linux which has its own address, 192.168.1.102. I've been noticing that whenever I shut down either machine and then turn them back on later, they acquire another address, which makes it annoying for me to make them communicate between each other (by, for example, trying to load a webpage hosted on the VM from the physical machine) without knowing the actual address, which, as I said earlier, seems to change every time.
I'd like to know if there's a way (with my router model) to configure it so that the sub network address of both machines remains the same, no matter whether or not they've been shut down and restarted.
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Sep 27, 2012
I have 4 x 2960 switches in a remote site. These are managed by an NMS in our DC, the NMS IP ends in 35.100 with a /23 mask.
When they are first booted, the switches are visable to the NMS, but after a week or 2, 3 of them drop connection to it. If you reboot them again they are fine. You are able to log onto them form thier local router and use a Radius server which is in the same subnet as the NMS.
The odd thing is, whilst they can not ping the NMS, they are able to ping any other addresses in the 34.0/23 range.
The config on the one that does not lose connection is the same as the other 3 and I have also rebooted the NMS.
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Oct 12, 2011
An 1841 is conencted to the internet by DSL, it works fine. I have added it to the 10.98.8.x subnet off a 3750 switch.When I connect other devices to the same switch port, I can ping/browse to them fine, but when I connect the 1841 I can only ping it from the 3750, not another subnet connected to the same router. [code]
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Dec 22, 2011
I have a Belkin model F9K1102 router supplying WAN/LAN connection to three PCs and 2 laptops. Two of the PCs are hardwired with the remainder PC and laptops are wireless. I'm using the default router IP of 192.168.2.1 and my ISP is Charter Cable (if that's of significance). The router is picking up all the dynamic IP information from my ISP and internal DHCP is enabled. Here's the issue though - when I connect a PC, laptop or iTouch (wired or wireless) with obtain IP settings automatically enabled the IP address it receives an IP address on a different subnet ie, 192.168.3.x and thus won't have WAN/LAN connection. I have tried to set the router IP to 192.168.3.1 and set the scope in the .3 subnet but the IP obtained by the device is .4! This makes no sense to me at all. The router is on the latest firmware (according to Belkin) and there doesn't seem to be any other update I can find. I have also tried another Belkin router (older model: F5D8236) and it does the same thing.
I'm not sure if this is related but I upgraded my service with Charter to a 18MB connection and a D3.0 Ubee cable modem - this issue seem to have began after this upgrade but I don't see how that would have any bearing on what is happening on my LAN IP scope and Charter tech support is pretty useless. My workaround is that I've static assigned an IP for each device in the same subnet as the router but it would be nice for the DHCP to function correctly.
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Aug 6, 2011
I have two locations both about 800meters apart, one is my home and the other address is a campsite where i have a linked router network (WDS with routers running ddwrt) where campers can all use the internet and also i have several IP cameras. Obviously both address have different gateways and therefore their own DHCP server. Everything was running perfectly until.I linked both of my address up using a long range antenna and now i am having problems.
Sometimes the two DHCP servers are competing with each other (i need both addresses on the same subnet in order to view my IP cams from home) and sometimes the computers log on to the wrong gateway. Its very annoying because the only way i can resolve it is by turning of the "linking routers" for a minute and then the Computers log onto the correct gateway. This happens to clients both side of the bridge. I have many different clients on both side of the bridge so assigning each computer (via windows) its fixed default gateway and DNS is out of the question as some of the clients are Camper's PC's and mine and my wifes laptops swap between both locations.
Now my query is, how can i block both DCHP servers from going over the bridge? OR can i have them on both separate subnets and still view my IP camera and still access all the routers from each subnet (i need this because sometimes i need to reboot the routers from home)
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Feb 11, 2013
I have an ASA5505 which provides internet (just internet) for about more than 600 pc/laptops. Can 5505's DHCP support this number?
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Jul 1, 2012
I've been searching the net for days now trying to configure the ASA5505 for dual DHCP ISP use. All guides available assume you have one static.
After realizing that it required a Security Plus license to even configure 3 VLANs.
I can choose a backup interface in ASDM. It even says dual ISP enabled. Why cant there be a guide or simple configuration example or am I the only one looking for this kind of solution?
Customer has two ADSL internet connections and want to switch between them if they fail. No load balancing required.
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Jan 30, 2013
Region : UnitedKingdom
Model : TL-WDR4300
Hardware Version : V1
Firmware Version : 3.13.23 Build 120820
ISP :
Region : UnitedKingdom
Model : TL-WDR3600
Hardware Version : V1
Firmware Version : 3.13.23 Build 120820
ISP : BT Infinity
I am running a Windows Home Server machine called "mserver" that has an IP address supplied via DHCP.There is also a local webserver running on port 8089 that I use to access media from several devices (Android Phone, Blackberry Playbook & HP Touchpad...i.e. not Microsoft).When I had the BT Homehub3 in use I could access the webserver via http://mserver:8089 and it would be loaded on all devices. With the WDR3600 used in place of the Homehub3 it cannot resolve mserver into a local IP address on a non windows device. I can access it via http://192.168.0.xxx:8089 so the route is there.Does the WDR3600 have any local DNS resolution? I repeat the BT HomeHub3 CAN do this, so why can't the TP-LINK?
P.S. I have tried :-
Disabling hardware NAT
Turning off UPNP & Port Forwarding
Restoring to factory default
Disabling all ALG's in security
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Feb 23, 2012
I've came across IP address that aren't enough for some users in the company. The IP addresses are more than enough to cater to the user's notebook or PC. However, some users does not know that there are actually limits to the IP we have, so quite a number of them actually uses their mobile / pads to tap the company's wireless.
I was wondering if i could restrict that particular user from tapping onto the network. I know it sounds a bit impossible because DHCP doesnt have that smart function to block whoever we sees deemed as a "nuisance".
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Nov 1, 2011
Based on my diagram, my computer A (192.168.100.11) can ping and access my computer B (192.168.10.14). But, when i'm home and i use remote access vpn (192.168.200.x) in cisco asa 5520 to connect to my computer A is okay. But, when i try to ping my computer B is not okay. I already do the exemption for 192.168.100.x and 192.168.10.x in nat rules for inside interface (192.168.100.2) ...
Should i put routing from outside 1.1.1.2 to 192.168.10.x by using 192.168.100.1 as a gateway?
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Jan 28, 2013
Region : Philippines
Model : TL-WDR4300
Hardware Version : V1
Firmware Version : 3.13.23 Build 120810 Rel.44064n
I have a PROLiNK H5001N ADSL Wireless Modem using bridge mode to my TL-WDR4300. I login to my ISP using the TL-WDR4300 with secondary connection to my modem so that I can open the modem setup page.
1.) My question is can the Prolink get DHCP address from the Wan Port of TL-WDR4300?
2.) Can I still use the Wifi of the modem to get internet?
3.) If I connect my ISP to Prolink then connect TL-WDR4300 thru static connection, will the NAT and Hardware NAT still work in the TL-WDR4300?
NOTE: the latest firmware built TL-WDR4300_V1_121225 seams to have internet connection lost problem after a few minutes. I reverted back to 3.12.23 and the problem is gone.
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Dec 9, 2012
Region : Poland
Model : TL-WDR4300
Hardware Version : V1
Firmware Version : 3.13.23 Build 120810 Rel.44064n
ISP : [url]...
I'm having issues with DHCP server not dealing IP after few hours (varies between 1h and 8h) of torrent traffic. If no continuous torrent traffic is applied, the problem does not occur. New wireless devices connect to the wi-fi network, but get stuck on 'getting IP adress'. The problem is with DHCP service or the wireless network service. New wired devices receive IP. The problem is only with wireless devices. I have no additional wireless device, that I can configure the network settings on my own (only phones) to check if it works without DHCP server giving IP. Wired connection is stable, but the bandwidth usage curve becomes somewhat similar to a sinewave.
I did disable the hardware NAT because that feature made the router unstable and caused it to hang up within minutes.
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Dec 6, 2012
Region : UnitedStates
Model : TL-WDR4300
Hardware Version : V1
Firmware Version : 3.13.23 Build 120810 Rel.44064n
ISP : Comcast
So I've been checking my router DHCP list and I usually use the WPS feature to add devices. I know how many devices I have and which ones are wireless etc. I've made address reservations on all the devices that I have and know of. One feature that really frustrates me (which is missing) is no way to rename a device. My iPhone is named: Reggie's iPhone yet the 4300 picks it up as Unknown... I dont understand why. I've renamed it on the iPhone to different things and restarted it but still it comes up as that. I have 2 Nexus 7s and both come up with wierd names, one is for my wife and one is for me and I wish there was a way to name it proper.
Question is: Will the name edit feature ever get added to it? I dont get why it's not there now, it's not really something major (I have a 5 year old router that even has that... and it cant even support N). It's really frustrating to have to guess and check the devices on my network because most of them come up as unknowns.
Right now I'm trying to located another device that's coming up as unknown and now matter how much I try, since the router lacks any feature to assist finding it, it's really frustrating.
something else i noticed: my DHCP List shows all the devices connected with their IP addresses, yet I went into CMD and was doing a random ping command. I'm able to ping 192.168.0.114 with perfect stats back yet on my DHCP List it shows the highest IP is at 192.168.0.112.... Is something wrong here? Is it supposed to not pick up the IPs it gives out? And of course since there isnt a way to tell if that IP is for a WIFI or ethernet device, I have no idea what that device is...
yet i found another ip address on my network by using the ping command. actually I went ahead and did arp -a to find out all the ips with mac addresses. this is a serious flaw with the security of this router!!
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Aug 25, 2011
Cisco ASA 5505 Security Plus 1 link with PPOE dialup for internet access
desirable situation: Primary link with a PPOE dialup Secondary Link with DHCP address Asignment
Problem: i want to configure Dual ISP Failover modus, but the problem exist when i configure the ip sla syntax it looks good in the running config. but after a reload the secondary line becomes primary
It looks like the ppoe client authentication is busy when the ip sla tracking mechanism becomes active. can i tweak the settings that the ip sla tracking mechanism starts later?
What i the correct config for Dual ISP setup with primary PPOE and secondary DHCP
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Jul 27, 2012
I recently noticed my 'Number of Dynamic DHCP Clients' on Network Settings is always empty. Before, it always registered a list since there are several devices that are connected to our wireless network (laptops, mobile phones, desktops).
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Jul 9, 2010
I've just got a WAG120N router and can't see anyway to see what devices are attached to the router or be able to assign static IP's
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Oct 11, 2012
I'm trying to set up a new Cisco SF500-24P switch for our new Polycom IP phones but I'm having some trouble configuring them. It seems a fairly basic setup - We have a Cisco 2800 series router which is configured in a router-on-a-stick scenario to give DHCP addresses to two vlans, '1' for data and '20' for voice...
ip dhcp pool DHCPROUTER
network 10.10.0.0 255.255.255.0
default-router 10.10.0.1
dns-server 10.20.124.200 10.20.124.201
[cod]....
The switch worked practically straight out of the box- when I connected a PC or a phone into it they both got addresses in the 10.10.0.0 range and both worked fine. In the web interface I then set the Voice VLAN ID as 20 and as soon as I did this the phones can no longer get addresses from DHCP (although PCs can). The switch and the phone display both show that the phone is in VLAN 20. All ports are members of VLAN1(native, untagged) and VLAN 20 (tagged) and the port connecting to the router is trunked, as are the others.Also, I can ping 172.16.0.1 from the switch so there is no routing problem, although I did try using the switch as a DHCP relay to 172.16.0.1 but still no luck.I'm not sure how relevant this is but one thing I noticed is that data going to the router untagged (and therefore in VLAN 1) gets through but if I tag it with VLAN 1 then it doesn't.
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Aug 7, 2006
I recently installed a WRT54G wireless router however I has this same question about my BEFSX41 Wired router.
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Mar 15, 2013
I have setup my network with two subnets (192.168.0.x and 192.168.1.x) and have a number of clients on both.I am using a Vigor 2750n router as my 'primary' router, and have a Server 2008 machine running RRAS as my other 'router'on the 192.168. 1. x subnet.On the 192.168.1.x network I have a server running DNS for local queries on that subnet and have 8.8.8.8 setup as a DNS forwarder. On the 192.168.0.x subnet I use the google DNS 8.8.8.8.I have setup a static route between the two subnets and am able to ping clients between each subnet.With regards to internet access, I am unable to get access to the internet from the 192.168.1.x subnet (no problems from 192.168.0.x subnet) and am unable to even ping a web IP address, and am wondering if I need to make any changes to the 2750's configuration to allow traffic from the other one to get out to the internet.
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Jan 12, 2012
I have a server which has multiple NIC's.NIC 1 is connected to the network / internet etc.NIC 2 is connected to a NAS drive.Obviously I can access the NAS drive from the server, but how can I access the NAS drive from devices on the network i.e. on NIC 1?Is it possible to access the NAS from a different subnet?
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Mar 15, 2013
I have setup my network with two subnets (192.168.0.x and 192.168.1.x) and have a number of clients on both. I am using a Vigor 2750n router as my 'primary' router, and have a Server 2008 machine running RRAS as my other 'router' on the 192.168.1.x subnet.
On the 192.168.1.x network I have a server running DNS for local queries on that subnet and have 8.8.8.8 setup as a DNS forwarder. On the 192.168.0.x subnet I use the google DNS 8.8.8.8.
I have setup a static route between the two subnets and am able to ping clients between each subnet.With regards to internet access, I am unable to get access to the internet from the 192.168.1.x subnet (no problems from 192.168.0.x subnet) and am unable to even ping a web IP address, and am wondering if I need to make any changes to the 2750's configuration to allow traffic from the other one to get out to the internet.
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Jun 12, 2012
I have old interface hardware with Static IP 10.2.2.200 and on the same switch I have computers with IPs of 10.4.1.0 If I change subnet to 255.0.0.0 old hardware with 10.2.2.200 will be accessible. The problem is that I would like to have 255.255.255.0 as subnet but it should still be possible to access 10.2.2.200. Can I add Static route for oldhardware in XP without adding gateway settings? The most simple would be to put all on same subnet but it is not possible due to a various reasons. The computers are running Windows XP
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Jul 12, 2011
I am working with a device that does not have a physical reset button on it, and have mistakenly typed in 127.x.x.127 for it's IP. I was trying to use 172, but mistyped and didn't catch it until after I had rebooted the unit. Is there anyway that I might be able to gain access to the device. My PC is running Windows 7, but I am familiar with linux as well. I have attempted to change the loopback adapter IP to 128 on a ubuntu live disc and set my ethernet port to the subnet the device is on with no avail. (I am also using vlans on the device, but believe I have them set up correctly)the device is set to IP: 127.x.x.127 netmask 255.255.255.128. [code] I know that the last octet of 127 is the broadcast IP for the range, but have been able to address similar blunders before by forcing myself to a /24 subnet to correct that.
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Aug 19, 2011
I have an RV042 with the PPTP server configured, which is working because I can connect with my iPad and droid phones, however, I'm unable to access resources on the RV042 side (192.168.1.X) when my local network is the same ip scheme (192.168.1.x). It works fine when I'm on a different network like 3G or someone else's Wifi network (192.168.11.X).
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Dec 26, 2011
i have 2x 27 subet ( we will call first /27 fip and call second /27 sip) we assign sip subnet to our virtual machine and we do not want assign ip from sip to our physical node and we wan assign ip from fip subnet to our physical server, because we want sip can not spoof physical server ips, so when we create vlan in our switch we set port 1 and fip and sip subnet access to this vlan in this senario can my virtual machine spoof our physical node ip ? some one in my datacenter technical team told me we should create vlan for fip and create a seprate vlan for sip then set vlan fip and vlan sip access to switch port #1 is it right? if it is ok can some one give me the commands for this senario which create 2 spetare vlan and access them to port siwtch #1 for exaple? we have cisco 2960 48 port ,
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Oct 16, 2012
it is each wireless access point need to have different subnet, if 24 users connect at the same time? will it be slow down if 24 user put in the same network?
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May 24, 2012
Got a shiny new SG 200 26P which seems to work fine operationally.owever, when I am trying to access the web interface from a different IP subnet, the web brower just times out.If I put my PC on the same IP subnet, it works just fine. From the other subnet, I can ping the switch fine. The default gateway is set on the switch, and from the web interface I can ping and dns resolve other hosts and on the internet. I've tried to create a management profile to 'allow all from everywhere' basically, but still no luck.I'm completely stumped. I've tried to reset to firmware defaults, and I'm now runinng the latest firmware. I woudl suppose that the switch would allow itself to be managed via the web interface from all subnets by default. Any thoughts? The fact that the switch can ping internet hosts makes be believe it's own default gateway and IP are all ok and working.. (and I can ping it from anywhere in my network).
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Sep 7, 2011
First off, let me preface this by saying that I'm a novice when it comes to firewalls and more specifically, the ASA. I do however, have an above average understanding of switches/routers.
We have an ASA 5510 running 8.3 and recently I've decided to clean up the last admin's mess. All hosts and servers are on the same subnet, multiple subnets on the same VLAN... and a slew of other problems. Anyway, I recently placed the IT department on another subnet to test some things out before I migrated other departments to different networks. Everything seems to be working as it should be with the exception of one of our servers. The IT subnet is 192.168.150.0/24 and the problem server is on the 192.168.10.xxx network. I'm guessing the issue lies somewhere in the fact this server does have a static NAT and is accessible from the public. Let me give you an overview of what our network looks like:
ISP ---->ASA----->3750----->2960
My workstation is directly plugged into the 3750 switch, and the server is plugged into the 2960. I'm able to ping this server by both IP and hostname. However, I cannot access port 80 by IP or hostname. The users that are on the 192.168.10 and 192.168.11 (sadly both of those are on the same VLAN) network are able to access this server without a problem. Thinking logically, I thought I would send a packet from my workstation, it would head to the layer 3 switch's VLAN interface corresponding to my subnet, realize the .10 network is directly connected and then forward the packet straight to the server. However, it doesn't seem to be working that way. It look like it's being routed to the ASA then being dropped. I guess there's an access rule or firewall rule preventing me from getting to the server. Is there a specific part of my config you will need to see...
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