[dpdk-users] arp behaviour on dpdk

Raja Jayapal raja.jayapal at tcs.com
Thu Aug 11 09:02:56 CEST 2016


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.

Thanks,
Raja

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