Cisco Routers :: WRVS4400Nv2 DHCP Relay On 2nd VLAN
Feb 24, 2011
Here's what I'm trying to figure out:
My network is set up such that I have a Wireless Network in VLAN 1, which is the primary network that we use. The subnet is 10.5.1.x.
My goal is to set up a completely isolated Guest Wireless Network, however it would work best. What I am trying to do now is I created a seperate VLAN (VLAN 2, IP range 10.5.2.x) and turned on DHCP on the WRVS4400N. However, in the Guest Network, it is always picking up a 10.5.1.x IP which is handed out by the DHCP server (10.5.1.5, Win 2003) and still routing all of the traffic to/from our private network.
Here's What I have set:
Wireless>Security Settings>Guest Network (SSID 2)
Wireless Isolation (between SSID w/o VLAN): EnabledWireless Isolation (within SSID): EnabledSetup>LAN>VLAN 1
Router IP 10.5.1.1, WLAN IP 10.5.1.3DHCP Relay for 10.5.1.5Setup>LAN>VLAN 2
Router IP 10.5.2.1DHCP Enabled for 10.5.2.x subnetDHCP Relay option is grayed out (not sure why)Setup>Advanced Routing
Inter-VLAN Routing: Disabled
Any way to solve this would be fine. I just do not want traffic routing through our internal network. Ideally, if I could get the Windows server to hand out 10.5.2.x addresses, that would be perfect, but I'm not sure how to configure it for such.
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Oct 15, 2012
I have a firewall that I want acting as a DHCP relay. This firewall has a number of VLAN interfaces serving clients. The DHCP relay destination is the IP address of a Windows 2012 Server running Microsoft DHCP which has multiple scopes configured, one for each client VLAN.What I'm finding confusing is how the DHCP will identify the client. Does the DHCP relay insert an identifier of some sort (opt. 54?) based on which VLAN the DHCPREQUEST comes from and then this identifier can be configured to be recognized on the DHCP server?
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Sep 12, 2012
I know how to disable the DHCP on the SRP527W but i was wondering how do i configure DHCP relay to point to a network DHCP server.
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Feb 14, 2012
I am trying to configure two 3845 routers to act as dhcp server and dhcp relay. Clients are connected to the router that relays all dhcp requests to the vrf instance which is used to connect it to the router wich is running dhcp server.
Router1
ip vrf dhcp_dns
rd 8:1
int gi0/0
ip vrf forwarding dhcp_dns
ip address 192.168.200.5 255.255.255.248
[code]...
So far I can see dhcp requests coming from the R1 and dhcp server on R2 replies with the dhcp offer but PC is not getting any ip.
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Nov 11, 2012
I have some DHCP trouble since I subnetted my network with a 2921. My clinets are in 172.16.2.0/23 and DHCP servers are in 172.16.5.0/24.Sometimes, randomly I guess, I get NACK from my DHCP server, and if I look into DHCP logs I got something like this:
15,11/09/12,09:52:27,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
15,11/09/12,09:52:28,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
15,11/09/12,09:52:29,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
[code]....
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Apr 3, 2012
Have a client wanting to hand out public ip addresses to all clients from a PFSense Firewall terminating the internet connection.
How do I allow the Cisco Switches currently in place, configured with private ip addresses in the 10.10.x.x ranges and Vlans, where the main 3550 layer 3 has defined dhcp scopes for each vlan, to relay dhcp requests from all vlans to the PFSense firewall?
I assume I would take off the currently defined dhcp scopes for the vlans and configure each vlan/switch with the ip helper address and specify the PFSense firewall and that Nat would have to be disabled onthe firewall?
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May 2, 2013
I am having trouble with connecting to the Internet through the router. It has worked for 4 years now and all of a sudden it is not working at all. Any direction to getting reconnected. I have an Internet connection directly to the modem, and I can connect and log into the router admin panel, but it will not allow me to access the Internet through the router either wirelessly or by connecting directly to the router. All the lights come on and flash like normal and I have done a factory reset and still nothing.
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Nov 14, 2012
I have the device configured in Router mode with 2 VLANs. I am able to communicate between the VLANs however my intention is to get VLAN 2 to talk to the internet and that is not working. A caveat is that I am not using the WAN port on this router at all.
The way I intend for this to work is that I have configured a default route on this device to point to a next hop IP in VLAN 1. Even though VLAN 1 is configured on this device the default gateway for this VLAN resides on another device upstream towards the internet connection. That upstream device is providing the DHCP etc for VLAN1. All devices in VLAN1 are able to get to the internet. Even the ones that reside behind this WRVS4400Nv2.
VLAN 2 is only configured on this device and the Default GW resides on this device. This WRVS is configured to be the DHCP server for this VLAN. Even though hosts in VLAN2 can communicate with devices in VLAN1 and vice-versa none of the hosts in VLAN2 are able to reach the internet. A simple ping gives the message "network unreachable from <IP of WRVS-VLAN2>. So it seems like the WRVS is not using the static default route.
I have upgraded the firmware to the latest version V2.0.2.1. Below is a simple diagram of the setup
VLAN-1 |
------- WRVS4400( IF: LAN1 )--------( IF: LAN1 )Generic Router( IF: WAN )---------INTERNET
VLAN-2 |
actually function as a router or is it that router mode is only to disable NAT and it really does not look up its routing table to route pkts out another LAN interface.
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Dec 23, 2011
I have two Cisco RV220W routers and I would like to realy DHCP from the home office to the remote office accross the IPsec Tunnel. Is this possible and if so how?
I have already gone into the IPv4 LAN (Local Network) settings on the remote router and set the DHCP mode to "DHCP Relay" providing the internal ip address of the home office router as the remote DHCP server.
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Jan 2, 2013
I have a Cisco RV220W router (firmware version 1.0.4.17).
I would like to have two separate networks with the following specifications:
Netwrork1: address range for the network is 192.168.0.1-254. All devices should be able to reach eachother within this network and connect to the internet either on LAN or through Wifi. From this network I should also be able to reach the device management page of the router. Also the devices should get the ip addresses throgh DHCP.
Network2: address range for the network is 192.168.5.1-254. All devices within this network should not be able to reach the devices in network1. All devices on this network should reach the internet through Wifi only. Device management page should not be available on this network.
I have configured the router as shown in the attached screenshots but the problem is that in Network2, devices get IPs from the 192.168.0.1-254 range and not from the 192.168.5.1-254 range. Also there is no internet on these either.
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Feb 6, 2013
I'm having a problem getting DHCP working with an ASR9k as shown in this document. I've successfully implemented very similar setups with some Cisco IOS routers, but the IOS XR on the ASR seems to be defeating me. Router A (happens to be a 3750)A DHCP/BOOTP/TFTP server, connected to router ARouter B - this is the ASR, running software version 4.0.3.Router A and B are connected by a layer-3 link.Router C (happens to be a Broadcom embedded router). It's connected to Router B by a VLAN trunk link.Device 1, this one needs to get its configuration by DHCP/BOOTP/TFTP. It's connected to Router C by a VLAN trunk link.Device 2, this one doesn't need any DHCP/BOOTP/TFTP. It's connected to Router C by a VLAN trunk link (its port is the same as Device 1's) Device 2 works great - it can ping the DHCP/BOOTP/TFTP server (and vice versa) and everything else it needs.
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Mar 17, 2011
I have a data center with virtual desktops and other shared infrastructure serving remote sites, some of which are connected to the data center with GRE over IPsec.
IP address management including DHCP is centralized in my architecture, but I simply cannot figure out how to relay DHCP requests through GRE over IPsec to my DHCP server cluster. I am working with Cisco 800 series VPN peers, and the VPNs are terminated either on a 1841 or a Juniper SRX. Everything else is just fine and dandy, but DHCP is not forwarded across the GRE tunnel.
As a workaround I am forced to use local DHCP pools on the VPN peers, which is extra work from a management point of view, and also precludes static IP address assignment where a local DHCP pool is in a VRF. My LAN devices are mostly thin clients, so I don't care if DHCP stops working when the WAN link fails. As such local pools have no upsides, they are only a tremendous hassle.
My config is very basic, public WAN in global routing table and WAN + GRE tunnel in a VRF. NAT is not used. Here are the DHCP-related configs I have tried:ip helper-address on the LAN gateway, both with and without ip forward-protocol udp bootpcip dhcp pool with relay options configured
In every case, I can see the UDP broadcasts hit the LAN gateway, but relayed packets never arrive at the other GRE tunnel endpoint let alone the DHCP server.
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Oct 15, 2009
I have defined several V LAN's and the corresponding IP Addresses on the SGE2000. The static routing works fine. On one V LAN there is a Windows 2003 DHCP Server which I have defined as DHCP Relay Server (Option 82), but no packets are relayed. Has anyone a functional setup, with dhcp relay?
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Nov 19, 2011
We assign (reserve by MAC actually) static IPs to all of our devices. Over time we have gotten rid of some devices but haven't begun (or finished really) re-using the old IPs. On our WRVS4400N v2 routers we are able to set the max number of DHCP users per Vlan. This prevents unauthorized devices trying to connect to our LAN.For example. I set the range from 192.168.1.100 - 192.168.1.103. IPs 100, 101, and 103 are in use (reserved via MAC address). We set max number of DHCP users to 3. This prevents someone from gaining access to 192.168.1.102. Does this make sense? Or at least this was the initial goal and it tested out successfully back when we implemented it.
How can I do the same for with the RV220W? I can set the range, assign static IPs (reserve IPs by MAC address), but can't keep others from gaining accessing to our LAN via the unused IPs (not assigned a static IP).My initial thought was to create static IPs (for the unused IPs) using dummy MAC addresses. I'm sure there is a much better way of accomplishing what I am trying to do.
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Nov 30, 2011
I am trying to get an understanding of some behaviour I am seeing on my N7Ks regarding DHCP relay.I have two identically configured Vlans interfaces both configured with the same two dhcp relay servers in the same order. The only difference between the two vlans is that one is HSRP active on the A side switch and the other is active on B side switch. All clients in Vlan136 (active on B side) are getting DHCP leases from the first of the two dhcp relay servers configured while all clients on Vlan 137 (active on A side) are getting DHCP leases from the second of the two dhcp relay servers. I would expect that all clients on both vlans would get leases from the first relay server configured unless that device was unavailable.
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Apr 12, 2012
Would like to impliment VLAN's on Cisco IOS Software, C3560 Software (C3560-IPSERVICES-M), Version 12.2(25)SEB4...But I need a DHCP Realy to my Windows Based DHCP Server. How do I enable DHCP Relay on the 3560?
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Jun 25, 2012
DHCP Relay on a SGE2000 switch.I have configured two VLANs on the switch, VLAN2 (192.168.10.x/24) and VLAN3 (192.168.9.x/24). I have the switch in Layer 3 mode. I have configured the DHCP relay server of 192.168.10.4 and the DHCP Interfaces as VLAN3. All of the IP Static Routes were generated by the switch.
If I put a client computer on a port that is Untagged VLAN 3 and try to get a DHCP address from the server on an Untagged VLAN 2 port I never get a response back.I have done some packet captures and here is what I have found:
I see the DHCP broadcast on the client computerI see the DHCP Request on the DHCP server coming from the IP assiged to the switch on VLAN 3 (192.168.9.254)I see the DHCP server respond with a DHCP OfferThe DHCP offer never gets to the client computer I can't seem to get a DHCP address to any system not on the same VLAN as the DHCP server. Option 82 is disable and I did try enabling it, which made no difference.
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Feb 12, 2013
Does SRW248G4P supports dhcp relay?I don't see any option for it with firmware version 1.0.2.
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Jun 17, 2012
how to configure dhcp relay agent and how it's work
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May 7, 2011
I am actually more of a 3Com guy than Cisco but I like to think I know my stuff and having just discovered this site I hope to join in as it looks a good place.I have a question about the general theroy underneath DHCP relay (IP Helper in the Cisco world I believe!)I've always put the DHCP server in VLAN1 only. A few weeks ago, I repatched the DHCP server in one of our offices (small site, single switch) into a different port by mistake. A few days ago I noticed (when doing something entirely unrelated) that I had left it in a port on both VLANs meant for PC's/phones. So, untagged on VLAN1, tagged on the voice VLAN. It had continued to work properly all that time however.By contrast, at a larger site, a new DHCP server came online and was put on a switch elsewhere in the building and was also put into a port on both VLANs - however things didn't work at all - of course we noticed immediately and changed the port setting to VLAN1 only, and it came back.In the second example, the server was on a different switch to where the main L3 switch for the Voice VLAN was (which also does the DHCP relay), and was connected over a fibre trunk link.Is there any reason why it should work on a single switch on a port on both VLANs, but not when connected over a trunk link? The server does not understand tagging. In the case where it worked, the phones were getting an IP from the correct scope; so the relay obviously must have been working with the server issuing an address based on the GIADDR field.
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Jun 30, 2012
I have a 2921 with 4 segments: [code] My DHCP server is 172.16.5.2 and I need to serve clients from 172.16.2.0/23 by MAC address and only to that segment.
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Mar 11, 2011
Here is the high-level question, please only respond if you have a conclusive answer with documentation to back it up. It seems simple, but all my research on forums and things have been confusing and conflicting.
When "ip helper-address" is used to enable the dhcp-relay function, will the DHCP packets get relayed through the VPN tunnel (if thats where the DHCP server is?) This question applies to Cisco IOS Routers and VPN appliances which have a Site-to-Site IPSEC VPN Tunnel to a place that hosts a DHCP server.
I'm using the Cisco 880 and 1800 series routers. I've already got DHCP relaying through IPSEC tunnels, but so far I've only set it up where my 2960 switch relays the DHCP messages to the VPN router on site (which is a separate device). I want to know if the router can pickup and relay through it's own tunnel natively.
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Dec 5, 2012
I am having some issues with getting DHCP Relay to fuction properly over our SG300-20 Switch.Out current layout is as follows. Hanging off the SG300-20 are a pair of Clustered Checkpoint Gateways with VLAN'ed interfaces in Both of our 2 VLANs, a 3COM 4200G In VLAN1 which has the DHCP server (And all the other Servers) connected to it, and a Pair of HP Procurve 2520's Stacked in VLAN 2 to provide PoE for our Phones/connectivity for our PCs.The problem is I cannot get the DHCP Relay to fuction from VLAN 1 to VLAN 2. If I assign an address in VLAN 2 manually to a device connected to the Procurves, everything works fine. I am able to reach both VLAN 1 and VLAN 2, but DHCP aquisition fails even if the device is connected directly to a port assigned to VLAN 2 on the SG300. The SG300 is running at Layer 3 currently also.
Here is a copy of the running config:
--------------------------------------------------------------------------------------------------------------
switch4db24f#show running-config
vlan database
vlan 2
exit
interface range gi8,gi16
switchport default-vlan tagged
[code]....
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Feb 1, 2012
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Mar 18, 2003
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May 9, 2013
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Used to doing ip helper-address x.x.x.x in other Catalyst switches, but not available here.
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Dec 13, 2012
We have a SBS 2003 server with two NIC's, one for the internal LAN and the other connecting to the WAG160Nv2 that is hooked up to the internet.The internal LAN clients are all getting IP addresses from the DHCP server in the SBS Server (192.168.16.XXX). The DHCP server is sat at 192.168.16.2.The only thing connected to the LAN ports on the WAG160Nv2 is the Internet facing NIC from the server.What I want to do is to get the WAG160Nv2 to give IP addresses to Wireless connections going through the router, can I configure the DHCP relay option on the WAG160Nv2 to do this, I have looked at the DHCP relay option but it doesn't seem to work, my wireless connections are getting private 169.254.xxx.xxx addresses.Also is there anything I can do to make the wireless more Apple friendly, iPhones and iPads drop of the wireless frequently, that's why I trying a different approach.
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May 29, 2012
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May 2, 2013
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Jul 30, 2012
How to configure cisco 3560 to force the client only can get ip by dhcp-relay server ?
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Now , I got my problem: I need to force the client only can get ip by dhcp-relay server, that means if anyone set static IP manunally , he can't really access to anywhere (to provent anyone set static IP with malignancy )
I know if a h3c router , how to set this configuration n svi configuration : dhcp relay security address-check enable )
the how to configure on a cisco 3560 ?
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Mar 29, 2012
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Sep 10, 2012
I am trying to configure DHCP relay through VPN, I read different articles, but I cannot figure it out: The setup is as follows:
Site1:
DHCP server: 192.168.200.21Cisco 877 ADSL router Internal IP: 192.168.200.12External IP: 194.99.99.194
Site2:
Cisco 5505 ASA (behind a ADSL router 192.168.1.1, vpn ports 500 and 4500 forwarded to ASA)Internal IP: 192.168.2.1External IP: 192.168.1.2
There is a working ip sec site to site vpn between site1 and 2. I want the clients on site2 to get an ip address from the dhcp server in site1.
On the Cisco ASA:dhcprelay server 192.168.200.21 outside dhcprelay enable inside set route should be on or off ?
Cryptomaps:permit 192.168.2.0 192.168.200.0 (original crypto)permit 192.168.1.2 192.168.200.21 (added)permit 192.168.2.1 192.168.200.21 (added)
Site1:
On the Cisco 877: Cryptomaps:permit 192.168.200.0 192.168.2.0 (original crypto)permit 192.168.200.21 192.168.1.2 (added)permit 192.168.200.21 192.168.2.1 (added). What NAT entries do I need to use on the ASA and 877 ?
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I have this piece at my home and just realized today that there is a new firmware available on the cisco web page. It has made the device more stable, but the most noticeable improvement is in the UI. Previously it was a linksys for business UI that was pretty much exactly like the consumer products. After the upgrade it is now a Cisco small business UI. I think that this will make the resellers take the products more seriously as a small business piece rather than an upgraded residential product.
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