Hello,
I am trying to understand the working of ARP in the earlier mentioned
topology
s1 --------- s2
l l l l
h1 h2 h3 h4
Switch running : Ofsoftswitch13
Controller Running ./bin/ryu-manager ryu.app.simple_switch_13
Now say h1 ping -c2 h4
At the controller side, I see these logs
*packet in 1 22:66:d9:ea:c0:25 ff:ff:ff:ff:ff:ff 1*
*packet in 2 22:66:d9:ea:c0:25 ff:ff:ff:ff:ff:ff 3*
*packet in 2 5a:1c:4e:38:7b:f5 22:66:d9:ea:c0:25 2*
*packet in 1 5a:1c:4e:38:7b:f5 22:66:d9:ea:c0:25 3*
*packet in 1 22:66:d9:ea:c0:25 5a:1c:4e:38:7b:f5 1*
*packet in 2 22:66:d9:ea:c0:25 5a:1c:4e:38:7b:f5 3*
*packet in 2 4e:a9:9d:a0:bc:17 33:33:00:00:00:fb 1*
*packet in 1 4e:a9:9d:a0:bc:17 33:33:00:00:00:fb 3*
*packet in 2 2a:b6:c4:15:e7:a2 33:33:00:00:00:fb 3*
*packet in 1 2a:b6:c4:15:e7:a2 33:33:00:00:00:fb 3*
FYI:
IP MAC
h1 10.0.0.1 22:66:d9:ea:c0:25
h2 10.0.0.2 2e:1e:81:dd:65:e8
h3 10.0.0.3 32:46:9c:bc:0e:c3
h4 10.0.04 5a:1c:4e:38:7b:f5
s1-eth1 56:86:fa:2e:28:9e
s1-eth2 7e:99:5e:7a:09:8c
s1-eth3 02:da:16:5c:31:18
s2-eth1 4e:a0:9d:a0:bc:17
s2-eth2 ae:3f:ff:2e:c4:df
s2-eth3 2a:b6:c4:15:e7::a2
The first line shows that it is ARP request with broadcast MAC received at
the controller.
My main point of doubt is that:
1. Where is the ARP Reply Constructed?
*CASE 1*: When the MAC Interface binding is already at the control plane?
*CASE 2:* When the Controller asks the switch to flood the ARP request
through its interface? say the destination host replies, that hey I am the
destination IP and my MAC is this. But the Reply also leads to PACKET_IN to
the controller and it learns the binding.
Doubt : In case 1, the ARP Reply is constructed at the controller?
In case 2: The ARP Reply is constructed by the destination host?
Help me know if my understanding is Right in case of Ryu controller?
Thank you
--
Ruchika Luthra
M.E (CS) 4th Sem
BITS Pilani
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