[ovs-discuss] Query on DEC_ttl action implementation in datapath

bindiya Kurle bindiyakurle at gmail.com
Tue Aug 27 08:11:44 UTC 2019


hi ,
I have a question related to dec_ttl action implemented in datapath.
when  dec_ttl action is configured in OVS following action get added in
datapath.

recirc_id(0),in_port(2),eth(),eth_type(0x0800),ipv4(ttl=64,frag=no),
packets:3, bytes:294, used:0.068s, actions:set(ipv4(ttl=63)),3,

if packet comes with different TTL on same port then one more action get
added in datapath.
for ex:
recirc_id(0),in_port(2),eth(),eth_type(0x0800),ipv4(ttl=9,frag=no),
packets:3, bytes:294, used:0.068s, actions:set(ipv4(ttl=8)),3,

Could someone please explain why dec_ttl is implemeted as a set action
rather than dec_ttl action.


I mean , why for different ttl one more rule get added rather than  just
adding it as  following as done in userspace

recirc_id(0),in_port(3),eth(),eth_type(0x0800),ipv4(frag=no), packets:3,
bytes:294, used:0.737s, actions:dec_ttl,2

Regards,
Bindiya
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