From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <vnish11@gmail.com> Received: from mail-ua0-f173.google.com (mail-ua0-f173.google.com [209.85.217.173]) by dpdk.org (Postfix) with ESMTP id 84D9A68CA for <users@dpdk.org>; Tue, 16 Aug 2016 20:48:51 +0200 (CEST) Received: by mail-ua0-f173.google.com with SMTP id 74so136757272uau.0 for <users@dpdk.org>; Tue, 16 Aug 2016 11:48:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=/fISNmJrKBOqrC0+wiZ99fIJgtkquw1D9IXLQeE1nTU=; b=ITB/0QPCQi8cCNLfdhN8rG/T03t6P/dsD3EMRICtLpsEDCJ22kc9k8e06YhMgLp01u PMMzPVYXtRPYrvvCyHPH4+8GhchJTeId7u6QJk3fN+ZLwVfH65gFnrZJfhB4xt6hgRLX 8Ii5P+sePbE3pMhaDuAQ6R8WhYqEAmmZ5WnpBaqUVw74U5b8Zx53cGcUEDTAXuN5eNcZ fj5N8XMmnFOF1nSXuiQHYxtWJGnXvQGlc9bIao4c2rx+wRm/RpDt4GVTyGkirkuJADHB aeTuzZTR3BIZO/7PZvbdsMp+HXvprSAeS4z9UtCYtaUjfwMzDI/S9aBrzUc4C/PGGRVG OOmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=/fISNmJrKBOqrC0+wiZ99fIJgtkquw1D9IXLQeE1nTU=; b=awRJYXkJa35XLh6S9gdDAg+IVCfb6oUq63Ue7dm//2hKbUMY5TNMCjU/qPd7tyIZBa UXM7uvBBDCs9o7Ytnm3cTEtaul0oYT9zCi5Eux3mJht3QpzBKEsbXkBNkNWMdsj/fnA8 2b4V/jXSOVcdYJVXZM3sdtseVHS4ScsFecVWtu4M1roCqw27S/UcAjtgO+h3gNOq9QKc /28kP9VVvEw8V3bP7lGPSK80mOgRXV6BWVOoNLNueQAKJMN12OEZciksB9CB68aVfao0 LNoWIwy5GrajPchY89ADwJpmxySBFyX3M59RfEwkwfGjqyFYHrjV3jasQDUQ/RZOTg3z 7+6w== X-Gm-Message-State: AEkoouunucLndbY48L4IPjeTBT5kxR+9jwF7wX285I7E0PLC7mlEjnsjERkNIWXs5z94eWLIfvsMHzfV6mhhPg== X-Received: by 10.31.166.20 with SMTP id p20mr17247248vke.2.1471373331002; Tue, 16 Aug 2016 11:48:51 -0700 (PDT) MIME-Version: 1.0 Received: by 10.31.148.18 with HTTP; Tue, 16 Aug 2016 11:48:50 -0700 (PDT) In-Reply-To: <20160816091841.1e649dee@xeon-e3> References: <CAHhCjUFFVBfNNRJObCmCFxF7RQvo+1gxBMgs65WbTeUHzxARNQ@mail.gmail.com> <OFB7BD4DAE.0037F717-ON6525800C.0025A3D8-6525800C.0026B8CA@tcs.com> <OFE50302C9.4FDCC38B-ON65258011.0024B27E-65258011.0024B29E@tcs.com> <20160816091841.1e649dee@xeon-e3> From: Nishant Verma <vnish11@gmail.com> Date: Tue, 16 Aug 2016 14:48:50 -0400 Message-ID: <CAHhCjUFM-DcjjnDvLp8P9KYZG0d_JmSkY5Y=Aqey5f-0BrnJSQ@mail.gmail.com> To: Raja Jayapal <raja.jayapal@tcs.com> Cc: "users@dpdk.org" <users@dpdk.org>, Nagaratna Patagar <nagaratna.patagar@tcs.com> Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: Re: [dpdk-users] arp behaviour on dpdk X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: usage discussions <users.dpdk.org> List-Unsubscribe: <http://dpdk.org/ml/options/users>, <mailto:users-request@dpdk.org?subject=unsubscribe> List-Archive: <http://dpdk.org/ml/archives/users/> List-Post: <mailto:users@dpdk.org> List-Help: <mailto:users-request@dpdk.org?subject=help> List-Subscribe: <http://dpdk.org/ml/listinfo/users>, <mailto:users-request@dpdk.org?subject=subscribe> X-List-Received-Date: Tue, 16 Aug 2016 18:48:51 -0000 Missing Attachment.. On Tue, Aug 16, 2016 at 12:18 PM, Stephen Hemminger < stephen@networkplumber.org> wrote: > On Tue, 16 Aug 2016 12:10:50 +0530 > Raja Jayapal <raja.jayapal@tcs.com> wrote: > > > Hi Nishant, > > > > Please find attachment for the pcap file. > > > > Thanks, > > Raja > > > > -----Nishant Verma <vnish11@gmail.com> wrote: ----- > > To: Raja Jayapal <raja.jayapal@tcs.com> > > From: Nishant Verma <vnish11@gmail.com> > > Date: 08/13/2016 02:42AM > > Cc: "users@dpdk.org" <users@dpdk.org>, Nagaratna Patagar < > nagaratna.patagar@tcs.com> > > Subject: Re: [dpdk-users] arp behaviour on dpdk > > > > Hi Raja, > > > > What i understand is that Br1(linux machine) is getting ARP request but > not sending ARP Response? > > If this is the case, it means either packet is not liked by Br1 hence > dropped or some how capture is not right. > > > > Can you share pcap file, captured at Br1. > > > > > > > > On Thu, Aug 11, 2016 at 3:02 AM, Raja Jayapal <raja.jayapal@tcs.com> > wrote: > > Hi All, > > > > I am running dpdk on KVM and would like to understand the arp behaviour > on dpdk ports. > > The topology is as below. > > > > br0(192.168.100.10)----> vnet0 -----> dpdk(NIC1- > e1000)------->dpdk(NIC2-e1000)------>vnet1----->br1(192.168.100.20) > > > > I am sending ARP packet from br0 using PackETH tool destined to br1. > > I have edited the dpdk l2fwd code in such a way that , the destination > is broadcast address(ffff). > > In br1 , i can see the arp resquest, but the host bridge is not > responding for the arp request. > > > > In br1: > > ===== > > tcpdump: verbose output suppressed, use -v or -vv for full protocol > decode > > listening on br1, link-type EN10MB (Ethernet), capture size 65535 bytes > > 12:21:15.459667 ARP, Request who-has 192.168.100.20 (00:0a:e7:2c:44:2b > (oui Unknown)) tell 192.168.100.10, length 46 > > 12:21:15.651610 ARP, Request who-has 192.168.100.20 (00:0a:e7:2c:44:2b > (oui Unknown)) tell 192.168.100.10, length 46 > > 12:21:15.867692 ARP, Request who-has 192.168.100.20 (00:0a:e7:2c:44:2b > (oui Unknown)) tell 192.168.100.10, length 46 > > > > In l2fwd application example also, the arp packets are getting received > on the adjacent ports, but the arp reply has not been sent back from br1. > > > > Could you please let me know how to make the host(br1) to reply the arp > request. > > The host kernel has a number of checks to prevent ARP spoofing. > Most likely your packet is invalid by one of these checks. > Linux ARP does not keep many statistics, so that doesn't help. > > Look at the arp_ignore sysctl flag and read kernel source for > net/ipv4/arp.c function > arp_process to see what is going on. If you are completely stuck build a > custom > kernel and instrument kernel with printk's there. > -- Rgds, Nishant