From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: MIME-version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="utf-8"; format="flowed" Message-id: <50081252.60909@versatic.net> Date: Thu, 19 Jul 2012 09:57:38 -0400 From: =?UTF-8?B?R2VuZXZpw6h2ZSBCYXN0aWVu?= References: <50076056.4050907@versatic.net> In-reply-to: Subject: Re: [B.A.T.M.A.N.] Internet gateway or not: dhcp or static ip? Reply-To: The list for a Better Approach To Mobile Ad-hoc Networking List-Id: The list for a Better Approach To Mobile Ad-hoc Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: b.a.t.m.a.n@lists.open-mesh.org Hi Guido, Thanks for the links. I guess we have the same general idea, yours is more developed than mine. Can I borrow some of your scripts? These packages could be made available to the batman community. I think they solve a common scenario and could be useful to others, though I did learn a lot about hotplug by working on this problem :D Cheers, Geneviève On 12-07-18 09:35 PM, Guido Iribarren wrote: > Another stab at this, which solves a slightly different scenario: > > https://bitbucket.org/guidoi/batmesh/raw/ee7042b01ebe/packages/batman-adv-auto-gw-mode/files/etc/hotplug.d/net/99-batman-gw > > This makes no assumptions about the interface (static or dhcp), but > instead asks for a lease in an alias (br-lan:ipv4) > > this is part of a bigger idea > https://bitbucket.org/guidoi/batmesh/src/ee7042b01ebe/packages/batman-adv-auto-gw-mode/ > > in a nutshell: every node is initially set to gw_mode=client, with > static ip and DHCP server (through dnsmasq) offering leases. > so if a client connects to the cloud, it gets an ipv4 and has basic > connectivity with other clients (bat cloud has no internet access) > > if one node has internet connection, sets gw_mode=server, (either > manually or by some magic script) , and this is recognized by other > nodes by this hotplug.d hook, which requests an ipv4 (so that routers > can do "opkg update" and sync ntp time) and at the same time kills the > local dhcp server, so that new clients get the lease from the internet > gateway dhcp. > > > On Wed, Jul 18, 2012 at 10:18 PM, Geneviève Bastien > wrote: >> Hi! >> >> I had a chat the other day on IRC about how to assign ip addresses whether >> there is an internet gateway available or not. >> >> Here is the problem and the solution I came up with. Let me know if that >> makes sense or if I'm complicating my life. >> >> * Problem * >> >> Our network is still small, there may or may not be an internet gateway >> available on it, it doesn't matter. From what I read here >> http://www.open-mesh.org/projects/batman-adv/wiki/Gateways for nodes to have >> access to the internet, the internet gateway has to be a dhcp server. >> >> The node requests an ip by dhcp and then knows what the default route is. >> But if the gateway disappears, there is no more dhcp server, the nodes do >> not have ip addresses and the mesh network is about useless. >> >> But if I set nodes with static ips, then the mesh is routable all the time, >> but nodes do not know the default route to reach the internet. >> >> Am I right so far? >> >> * Solution * >> >> Someone on irc pointed me out to this page: >> http://www.open-mesh.org/projects/batman-adv/wiki/Uevent >> I use this uevent to send a dhcp request if a gateway becomes available or >> go back to a static ip if all gateways are gone. >> >> Attached is the hotplug script I use. It is in >> /etc/hotplug.d/net/99-batman-adv-gw. It supposes the interface is >> configured by default with a static ip. >> >> It works perfectly, but I can't believe there is no simpler solution to >> this. Our problem should be a quite common one. What is the general >> solution to it? >> >> Thanks, >> Geneviève