[dpdk-users] Fw: Re: arp behaviour on dpdk

Raja Jayapal raja.jayapal at tcs.com
Wed Aug 17 08:45:39 CEST 2016

Hi Nishant,

Please find attachment for the pcap file.


-----Nishant Verma <vnish11 at gmail.com> wrote: -----
To: Raja Jayapal <raja.jayapal at tcs.com>
From: Nishant Verma <vnish11 at gmail.com>
Date: 08/13/2016 02:42AM
Cc: "users at dpdk.org" <users at dpdk.org>, Nagaratna Patagar <nagaratna.patagar at 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 at 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(> vnet0 -----> dpdk(NIC1- e1000)------->dpdk(NIC2-e1000)------>vnet1----->br1(
 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 (00:0a:e7:2c:44:2b (oui Unknown)) tell, length 46
 12:21:15.651610 ARP, Request who-has (00:0a:e7:2c:44:2b (oui Unknown)) tell, length 46
 12:21:15.867692 ARP, Request who-has (00:0a:e7:2c:44:2b (oui Unknown)) tell, 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.
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