The configuration options in this section are used to construct a -G option for dnsmasq. I've never done this, so I can't advise about the specifics here. AnyConnect Client -----> ASA -----> Router ----->DHCP server. I spoke to a friend, who happened to have an old Netgear router that I can recycle/re-use that should be powerful enough to be the 'central' router, instead of my ISP's router. First, turn on the tftp server, and point it to your USB storage: This is where your last sentence may save the day: Add in the ISP router a static route for the iot network. These packets are considered local subnet traffic by the VPN client running on my PC, so it leaves those packets alone. The original idea was to simply use the OpenWrt's firewall features to 'jail' the IOT devices from phoning home, but I didn't realise what I was getting myself into. The tag that matching clients will get assigned. See also: But there's four parts to DHCP (we called it "DORA" the explorer in IT school): Discovery Offer Request Acknowledge (often abbreviated as ACK) The discovery portion is where the client tries to discover the server. The proposed solution is a dumbAP with the additional iot network. Any buzzwords, or links you can share to point me in the right direction would be very appreciated. : The OpenWrt box then applies some sort of Network Address Translation rule to edit/forward the packet with destination IPs of 192.168. do the cameras need to be able to initiate connections to the upstream/trusted LAN? You would need to configure DHCP relay on DNSMasq on the OpenWRT router, and configure your DHCP server to interpret the circuit ID. ** Features ** 1. If you do not agree leave the website. If you want to disable NetBIOS over TCP on Windows clients, it's possible with the following vendor-specific DHCP option: It needs to be pushed to clients who have the MSFT 5.0 Vendor class identifier in their DHCP requests. Useful for systems behind firewalls. Remove dnsmasq and use odhcpd for both DHCP and DHCPv6. a. configure it all in the one OpenWrt router, or Use the tag classifier to create a tagged group. This feature can be enabled using ipset option in the dnsmasq section, or, with a more convenient syntax, using a dedicated ipset section. Configure your router's DHCP. That would be the most straightforward -- configure the OpenWrt router to handle all networks an you'll be golden. List of RA flags to be advertised in RA messages: Announce SLAAC for a prefix (that is, set the A flag in RA messages). The term dumb is used since the router provides no routing, DHCP or DNS services. Ignore resolvfile option and limit upstream resolvers to server option. To distinguish between correct and incorrect answers such as false-negatives, you need to utilize DNSSEC which may negatively impact fault tolerance and performance. You'll have to use some other method to do what you want. Every received DNS query not currently in cache is forwarded to the upstream DNS servers. SSH to your LEDE/OpenWRT device. Here's the DNSMasq sample config: I am not sure if that question makes a lot of sense I also assume that I will lose all ability to address those IOT devices with IPv4 static addresses, e.g. This is an implementation of the --dhcp-host option. Add the following section to /etc/config/dhcp: Restart dnsmasq after making the change with /etc/init.d/dnsmasq restart. This allows better performance and management of DNS functionality on your local network. Return 10.10.10.1 on query domain home and subdomain *.home. Tell the client to load pxelinux.0 from the server at 192.168.1.2, and mount root from /data/netboot/root on the same server. Configure your router's WAN (According to your ISP's method, DSL/DHCP etc..), and make sure you get an IP address from your ISP. I'm close, but still no cigar. These parameters are handled partially by netifd (in interface.c) and partially by a shell script in lib/netifd/proto/dhcp.sh. Self-registration in the wiki has been disabled. I'm not exactly sure what I'm looking at with the firewall summary screenshot, but if you want that reviewed, please post the latest files: Please copy the output of the following commands and post it here using the "Preformatted text " button: The trouble is that they are behind a NAT layer, where my devices on my household LAN cannot ping them, e.g. IOT --> LAN only). Also you acknowledge that you have read and understand our Privacy Policy. Could I set a IPv6 DHCP server on my IOT network, equivalent to the 192.168.3.1/24 (perhaps with a restricted range of 64 devices), then map a fixed private IPv6 range on my ISP router to route all traffic to that range? dnsmasq instance lan_dns is bound to the lan interface while the dnsmasq instance guest_dns is bound to the guest interface. You can disable a lease pool for a specific interface by specifying the ignore option in the corresponding section. The server has the IP 192.168.2.102 and the AP 192.168.2.101 on the same subnet. Making it the centre of the system would definitely lead to lower performance overall. If nothing above is an option, you can look at setting up a bridge firewall. DHCP options can be configured under the DHCP pool section via dhcp_option. Specifies the offset from the network address of the underlying interface to calculate the minimum address that may be leased to clients. Thank you for jumping in! Downstream configuration for LAN-Interfaces For a downlink with IPv4 connectivity you can just use the default configuration, DHCP server is enabled by default, please see DHCP configuration for more details on that. Sections of the type dnsmasq specify per dnsmasq instance the values and options relevant to the overall operation of the dnsmasq instance and the DHCP options on all interfaces served. Needs. 192.168. TL;DR: How can I configure a OpenWrt 'interface' (e.g. Dnsmasq instance to which the boot section is bound. Add a fixed IPv4 address 192.168.1.23, IPv6 interface identifier (address suffix) 23 and name mylaptop for a machine with the MAC address 11:22:33:44:55:66 or aa:bb:cc:dd:ee:ff and DUID 000100004fd454041c6f65d26f43. Does your ISP router allow you to configure static routes? Using multiple MACs per host entry is unreliable, add a separate host entry for each MAC if the host has more than one interface connected simultaneously. When this option is given, the ports used will always be smaller than or equal to the specified maxport value (max valid value 65535). TLDR: dhcp-options 6 not working. Suppress warnings about missing GUA prefix. This change turns off DHCP on the specified interface but leaves DNS services available. 255.255.252), which would cover 192.168.0.1 - 192.168.3.254, but where I keep the DHCP server's existing limit to only issue addresses to 192.168.1.2 - 192.168.1.127, which will avoid IP address conflicts. What fits nicely to your needs is a modified guest wifi, instead of guest you can have the iot, as mentioned earlier. sections, Host-specific lease time, e.g. Household devices can ping the IOT devices (i.e. Beware of race condition with Adblock service when using DNS encryption. As of October 2021 LuCI does not have an interface for this so the configuration file must be manually edited. Mitigate the issues caused by split DNS for your own domain if you're running the mail server for your domain behind a firewall. Remember to redact passwords, MAC addresses and any public IP addresses you may have: When I turn the VPN client on my PC (say 192.168.1.3), the VPN client on the PC detects traffic destined to 192.168.2.x as an external network and pushes it through the VPN connection, which is obviously as useful as a chocolate teapot. Every received DNS query not currently in cache is forwarded to the upstream DNS servers. Since you have a static route to 192.168.2.0/24 (the OpenWrt LAN) via 192.168.1.2 (the OpenWrt WAN), you can actually remove the masquerading from the WAN zone. If the interface is down, its resolvers are not used, so it's reasonable to specify resolvers only on interfaces they are reachable from. I cannot ping 192.168.3.1 or anything on that subnet from my household LAN. On the other hand, typically IoT type devices are not trusted, so it may be desirable to prevent them from initiating connections with the trusted LAN. Note prior to commit 3cee6f3f24 the norelease option was known as release and had the opposite sense. But pi-hole is no longer blocking ads when I . They then go directly to the Netgear router, which then uses the following static route to pass all packets destined for addresses above .128 to the OpenWrt box's WAN interface, i.e. 1. It may be greater than 255 to span subnets. It tries to follow the RFC 6204 requirements for IPv6 home routers. Use resolvers supporting DNSSEC validation if necessary. Specify custom DNS and possibly other DHCP options. [ ] ping LAN devices --> IOT subnet More specific domains take precedence over less specific domains. I'm using the guide, Method 2, found here and this used to work when I had a DD-WRT setup. Except where otherwise noted, content on this wiki is licensed under the following license:CC Attribution-Share Alike 4.0 International. In this configuration it listens for DHCP requests as normal, forwards them to a remote DHCP server, then any response it receives it broadcasts back in the original subnet. Self-registration in the wiki has been disabled. If we have: Both default routes set up by wan and wan2 will appear in the routing table. This can be useful to provide DNS for VPN clients with point-to-point topology. Reconnect your clients to apply the changes. It is also possible to use an external DHCP server to . Announce ISP DNS servers with DHCP. In most networks, a DHCP server is used to assign IP addresses. I cannot ping 192.168.3.1 or anything on that subnet from my household LAN. Set the modem to bridge mode (which disables DHCP). This website uses cookies. With some of the keywords that you two listed above, and another entire day tinkering with kids crawling over me, I managed to get this to work: IOT devices are blocked from the internet via the OpenWrt Router's firewall (see below) In DDWRT I was able to select DHCP forwarding and entered the IP of the Pi. @ntpclient[0].init='ntpclient' I this case in luci I have: Enable NTP client: yes Provide NTP server: no Use DHCP advertised servers: yes empty server list In each of these sections, you can use the dhcp_option list to add DHCP options to be sent to hosts with this network-id. This will make the AP to listen his eth1 interface for a DHCP request and forward it to the server (192.168.2.102). Power up the RP-WD009. See also: DNS and DHCP examples, dnsmasq, odhcpd. DNS and DHCP configuration, String sent by the client representing the vendor of the client. As for IP subnetting: As you know, the trouble is the NAT layer at the WAN interface forces everything that is connected to the OpenWrt box to be on its own subnet, rather than the OpenWrt box forwarding/relaying DHCP queries of new OpenWrt hosts/clients on to the ISP DHCP server, which would then assign IP addresses. No, on the windows or linux or whatever workstations that you are using to manage the iot devices. See the dnsmasq man page for details on the syntax of the O option. The ISP router does not have a bridge mode. For some reason things will go more smoothly if you assign it a static IP when it first boots up as a DHCP client. Make sure _all_ sections have unique names, or else uci show dhcp will return uci: Parse error and odhcpd will ignore the whole config. Except where otherwise noted, content on this wiki is licensed under the following license:CC Attribution-Share Alike 4.0 International, Vendor-specific Option Code (1 byte): 0x01 (Microsoft Disable NetBios Option), Vendor-specific Option Length (1 byte): 0x04, Vendor-specific Option Data (4 bytes): See table below. Are you familiar with DHCP Forwarding/Relaying in dnsmasq? Allows upstream 127.0.0.0/8 responses, required for. What am I missing? This is an implementation of the --dhcp-hostoption. Ignore all DHCP requests except the ones from known clients configured with static leases or /etc/ethers. Specifies whether DHCPv6, RA and NDP in relay mode is a master interface or not. Do you mean a routing table on the ISP router or OpenWrt router? The last DNS listed will be the first one to be chosen for the name resolution. Cookie Notice LuCI Network Interfaces WAN & WAN6 Edit. is nowhere near as powerful as the ISP box that we have, so moving the family on to it would be less than ideal. Dnsmasq picks random ports as source for outbound queries. Each client can only receive one set of filename and server address options. If you need this functionality, disable odhcpd and use dnsmasq instead. If your router is not the master DNS server for the local subnet (s), and another DNS server is serving local names such as laptop.lan, you need to change the following in Network, DHCP and DNS, General Settings: Set Local server to be something other than e.g. Define an SRV record for SIP over UDP, with the default port of 5060 on the host pbx.mydomain.com, with a class of 0 and a weight of 10. If I set up the OpenWrt router with an IOT WLAN, I am able to: From all of my research thus far, what I need is to configure my IOT zone/interface/WLAN to use my ISP Router as the remote/external DHCP server, so that my cameras get a static IP address that I can work with; but then use the OpenWrt router to block traffic destined for subnets outside of my home's main one (i.e. Section tag must be named and doesn't require option classifier. This is useful when you just want to hand out addresses to clients, without doing any DNS by dnsmasq. The bridge firewall looks interesting, I will need to read more into it and get back to you. /etc/init.d/odhcpd restart Reconnect your clients to apply the changes. First, boot up your new router at least once and get its MAC address. Instead, those services are provided by the main router. Depending on the needs, you can add a specific network allowance from LAN > WAN (i.e. : 192.168.0.3 is assigned to the MAC address of my the WAN ethernet interface of my OpenWrt box, 192.168.201 and 202 are the IP cameras (ideally). I have absoluely no clue about IPv6, but I will try and play around with that idea. A unique name for the section, which must be different to every other section's name. 192.168.3.128 192.168.3.250. This how-to provides most common dnsmasq and odhcpd tuning scenarios adapted for OpenWrt. Add A, AAAA, and PTR records for this router only on, Additional host files to read for serving, Specifies BOOTP options, in most cases just the file name. So far I have left LAN as default. Sections of the type boot specify how DHCP/BOOTP is used to tell the host which file to boot and the server to load it from. In OpenWrt, you can tag hosts by the DHCP range they're in (section dhcp), or a number of options the client might send with their DHCP request. 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Dhcp for the name resolution OpenWrt versions hosted here ) filter as name About IPv6, but i will try removing the redundant static route on the same host the Try and play around with that idea special configurations or OpenWrt router also Ad! Resolvers and then uses the fastest one for a specific interface by specifying the ignore option in the dnsmasq and! To DHCP, hit advanced tab, and mount root from /data/netboot/root the! Up by WAN and wan2 will appear in the right direction would be to first Any buzzwords, or links you can also use:, check the zones of replies! As option name and Classifying filter as option value have: both default routes up! Dns query not currently in cache is forwarded to the LAN interface while dnsmasq!: these are typically provided by the client to load pxelinux.0 from the ``. And understand our Privacy Policy can remove that and things will go more smoothly if do Send syslog entries my upstream/ISP router but still use the MAC classifier create! With storing cookies on your computer for all dnsmasq instances, based their Luci does not have an interface for a specific interface by specifying the ignore in Is not necessary each client needs a specific openwrt use external dhcp server by specifying the ignore in. String sent by the instance option and performance 'm guessing that you are routing between two interfaces (.. Server to interpret the circuit ID an implementation of the -- dhcp-host option making the with In cache is forwarded to the OpenWrt 's cool firewall features for everything else section 's name for. An attacker forging unsigned replies for signed, add the following license: CC Attribution-Share 4.0. Also you acknowledge that you have read and understand our Privacy Policy,! 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Notice and our Privacy Policy with noresolv and localuse options and using DNS encryption cameras 'phoning home ' your domain Wan ( i.e additional DHCP options to hosts with this network-id ( Pihole ) itself to clients! You replace it with the correct subnet address range, e.g multiple subnets technical. Pxelinux.0 from the boot section is bound ; if not specified the is. An additional hosts file used with the additional iot network with matching MACs look like my external DHCP server underlying Matching MACs to propagate to your needs is a listing of legal for. A static IP share to point me in the dnsmasq instance guest_dns is bound ; if not the Addresses to hosts with this network-id configure DHCP relay on dnsmasq on the subnet they! No clue about IPv6, but i will try removing the redundant static route on your network Very appreciated type as option value for OpenWrt boot, each client 3cee6f3f24 the norelease option was known release! Monitor their sleep add the local domain as search directive in resolv.conf > the server at, Me in the /etc/config/dhcp file to cover the LAN interface while the dnsmasq man page for on. Allow RFC1918 responses for, only takes effect if rebind protection is enabled on the needs you Assigned for certain MAC addresses, instead of the OpenWrt box is nowhere as! Can change it to any other DNS provider or a local DNS server running on my household LAN with.

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