lime-dev May 2014

lime-dev@lists.libremesh.org

13 participants
8 discussions

by al

Hey people, some Libre-mesh presence on this events? I think if Libre-mesh wants to be "The Meta-Firmware for Community Mesh Networks" has the obligation to be there: * Wireless Battle of the Mesh v7 in Leipzig (Germany) - May 12-18 http://battlemesh.org/BattleMeshV7 * Salut, Amor i Xarxa (SAX) in Morella (Països Catalans) - June 7-8 https://sites.google.com/site/sax2014morella/home (yeah, incredible: in google sites!) * Backbone 409 in Calafou (Països Catalans) - June 14-15 http://backbone409.calafou.org/

11 years, 1 month

Lost password form on the site

by Ilario Gelmetti

Hi all! I'm Ilario from NinuxVerona (Italy), in NinuxVerona we use Libre-Mesh but up to now we have only one wireless link (UbiquitiPicoStationM2-wire-switch-wire-UbiquitiNanoStationM5-wireless-UbiquitiNanoStationM5). I registered on the libre-mesh site but the confirmation email never arrived, now the "lost password" page says "An email with instructions to choose a new password has been sent to you." but I can't see any email. Is it possible to become an editor of the libre-mesh site? Thanks, … [View More]

11 years, 1 month

Ipv4 editing

by Gioacchino Mazzurco

I have seen this commit from guii, does it permit editing ipv4 in /etc/config/lime or does it edit /etc/config/network ? https://github.com/libre-mesh/lime-packages/commit/9aa4fcceade64db4abafba31…

11 years, 1 month

I have installed the firmware. Now what? =)

by Ramiro Polla

Hi, I have compiled the firmware using lime-build for tl-mr3020, and then installed the firmware on two routers. The mesh works, they can see each other and I can connect to them as Access Points. Now I have two questions: 1. How do I connect a router to the Internet? 2. How do I share this connection with the mesh? For (1), I tried scanning for wifi networks but I got an error that libiwinfo-lua was missing. I connected to a network through ssh using wpa_supplicant and installed libiwinfo-… [View More]

11 years, 1 month

Issue: asymmetric bmx6 tunnels break PMTUD

by Gui Iribarren

Hey axel! so, we've scratching our heads today, facing some MTU issues on our shiny new libre-mesh network, and after a few hours debugging, tcpdumping and discussing, we came to these conclusions: * the invented src-addr in the bmxOut tunnel makes it impossible for hops along the path to return "Packet Too Big" to the originating node. So, if a particular link has a smaller MTU than the first link (say, a VPN is involved), the packet will be silently dropped. A==1500==B---1400---C==… [View More]=1500===D A wants to send a packet to a network announced by D; so it creates a tunnel with D as destination, and a "D-derived" fake address as src, that matches the bmxIn "catchall" tunnel peer-addr in D Then sends a 1460 + 40 = 1500 bytes packet through that tunnel, B cannot push that packet to C, then tries to send back a ICMPv6 PTB... but the src-addr it finds in the encapsulation is not A, but instead the "D-derived" fake addr. Then, the ICMPv6 PTB is lost and A can never find out about the smaller MTU. This fundamentally breaks PMTUD which is a bad idea in IPv6 to avoid this there are 3 options: * set mtu=1280 on every bmxOut tunnel (yuck! :( ) * probe before establishing each tunnel, with the real src-addr so that PMTUD can happen correctly, until it reaches the desired endpoint node. Then, use discovered PMTU for new tunnel. (*downside*: this will only work as long as path doesn't change to pass through some thinner link. In that case, PMTU will not be rediscovered, and packets will be dropped again.) * use the current bmxIn "catchall" tunnels only for sending special bmx6 control packets, that ask for a symmetric tunnel. i.e. 1) A sends to D (2001:db8::D) a packet (encapsulated with a fake src-addr, to be catched by the catchall @ D) with content "I'm A and this is my real address 2001:db8::A; please make a dedicated tunnel for me" 2) D gets that packet and creates a tunnel with "peer 2001:db8::A", then sends back an ACK to A, again using "A-derived" fake-addr as src 3) A gets the ACK and creates the tunnel with "peer 2001:db8::D" *** now both ends have a symmetric tunnel between them, with real src and dest address *** 4) A finally sends the real payload through the symmetric tunnel, this payload (may be bigger than 1280, say... 1450) will be encapsulated with the real src-addr of A, so if any node in the path needs to send back a Packet-too-big, will be able to, and PMTUD will happen correctly. (at the cost of a full RTT latency before the first payload packet, but with a reasonable tunnel expire time as it has currently, that shouldn't be terrible) back in April, i remember we discussed the idea of symmetric tunnels, and you brought up this "control connection" idea which i'm simply redescribing here. But that discussion was in another context, more like a 'feature', and finally didn't really solve the idea we had originally, yet, this PMTUD issue was not taken into account AFAIR, so the "symmetric tunnel" idea now becomes more like a bugfix (i.e. don't create PMTUD blackholes) what do you think? Cheers!! gui [View Less]

11 years, 1 month

Re: [lime-dev] [freifunk-gsoc-students] Post for GSoC 2014 blog (Hardware Detection)

by Francisco Jiménez González

Hi, I have already published it on the blog: http://blog.freifunk.net/2014/hardware-detection-libremesh-gsoc-2014 I have selected Software as kategorien, Is it correct? let's me know if something is wrong so I will change it thank you!! ;) 2014-05-09 14:04 GMT+02:00 Mario Behling <mariobehling(a)gmail.com>: > Hi, > Please let us know when your posts are in the final version and if you > want to publish it yourself on the blog or we should do it. > Thanks > M. > On … [View More]

11 years, 1 month

Post for GSoC 2014 blog (Hardware Detection)

by Francisco Jiménez González

Hi everyone! I have written the post for the Freifunk's blog here: http://pad.eigenlab.org/p/QPRE5WCuW0 Feel free to contribute on it by changing, adding or removing things Thank you and regards, Francisco

11 years, 1 month

Working on Libre-mesh HowTo for Guifi.net workers

by al

Hi from Garraf (Barcelona). Here we are with Gioacchino installing Libre-mesh nodes around and we are going to train a local group to lead Libre-mesh. People here use, understand and install guifi.net infraestructure nodes (RouterOS, AirOS, AP-WDS and BGP in both 5GHz and 2.4GHz), and they don't know more. So I just start to write a Libre-mesh HowTo oriented to this kind of base knowledge. I'm writing it in spanish and later I'm going to translate it to english and catalan. It's going to become … [View More]

11 years, 2 months

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lime-dev May 2014