<s>
Transparent	O
Inter	B-Operating_System
Process	I-Operating_System
Communication	I-Operating_System
(	O
TIPC	O
)	O
is	O
an	O
Inter-process	B-Operating_System
communication	I-Operating_System
(	O
IPC	O
)	O
service	O
in	O
Linux	B-Operating_System
designed	O
for	O
cluster-wide	O
operation	O
.	O
</s>
<s>
It	O
is	O
sometimes	O
presented	O
as	O
Cluster	O
Domain	O
Sockets	O
,	O
in	O
contrast	O
to	O
the	O
well-known	O
Unix	O
Domain	O
Socket	O
service	O
;	O
the	O
latter	O
working	O
only	O
on	O
a	O
single	O
kernel	B-Operating_System
.	O
</s>
<s>
The	O
TIPC	O
protocol	O
is	O
available	O
as	O
a	O
module	O
in	O
the	O
mainstream	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
and	O
hence	O
in	O
most	O
Linux	B-Operating_System
distributions	O
.	O
</s>
<s>
The	O
TIPC	O
project	O
also	O
provides	O
open	B-License
source	I-License
implementations	O
of	O
the	O
protocol	O
for	O
other	O
operating	B-General_Concept
systems	I-General_Concept
including	O
Wind	O
River	O
's	O
VxWorks	B-Operating_System
and	O
Sun	O
Microsystems	O
 '	O
Solaris	B-Application
.	O
</s>
<s>
TIPC	O
applications	O
are	O
typically	O
written	O
in	O
C	B-Language
(	O
or	O
C++	B-Language
)	O
and	O
utilize	O
sockets	O
of	O
the	O
AF_TIPC	O
address	O
family	O
.	O
</s>
<s>
Support	O
for	O
Go	B-Application
,	O
D	B-Application
,	O
Perl	B-Language
,	O
Python	B-Language
,	O
and	O
Ruby	B-Language
is	O
also	O
available	O
.	O
</s>
<s>
The	O
port	O
number	O
is	O
generated	O
by	O
the	O
system	O
when	O
the	O
socket	O
is	O
created	O
,	O
and	O
the	O
node	O
number	O
is	O
either	O
set	O
by	O
configuration	O
or	O
,	O
-	O
from	O
Linux	B-Operating_System
4.17	O
,	O
generated	O
from	O
the	O
corresponding	O
node	O
identity	O
.	O
</s>
<s>
Datagram	B-Protocol
messages	O
are	O
discrete	O
data	O
units	O
between	O
1	O
and	O
66,000	O
byte	O
of	O
length	O
,	O
transmitted	O
between	O
non-connected	O
sockets	O
.	O
</s>
<s>
Just	O
like	O
their	O
UDP	B-Protocol
counterparts	O
,	O
TIPC	O
datagrams	B-Protocol
are	O
not	O
guaranteed	O
to	O
reach	O
their	O
destination	O
,	O
but	O
their	O
chances	O
of	O
being	O
delivered	O
are	O
still	O
much	O
better	O
than	O
for	O
the	O
former	O
.	O
</s>
<s>
Because	O
of	O
the	O
link	O
layer	O
delivery	O
guarantee	O
,	O
the	O
only	O
limiting	O
factor	O
for	O
datagram	B-Protocol
delivery	O
is	O
the	O
socket	O
receive	O
buffer	O
size	O
.	O
</s>
<s>
Datagrams	B-Protocol
can	O
be	O
transmitted	O
in	O
three	O
different	O
ways	O
.	O
</s>
<s>
TIPC	O
multicast	O
will	O
leverage	O
use	O
of	O
UDP	B-Protocol
multicast	O
or	O
Ethernet	O
broadcast	O
whenever	O
possible	O
.	O
</s>
<s>
However	O
,	O
in	O
TIPC	O
the	O
client	O
and	O
server	O
use	O
service	O
addresses	O
or	O
ranges	O
instead	O
of	O
port	O
numbers	O
and	O
IP	B-Protocol
addresses	O
.	O
</s>
<s>
When	O
a	O
socket	O
is	O
ungraciously	O
closed	O
,	O
either	O
by	O
the	O
user	O
or	O
because	O
of	O
a	O
process	O
crash	O
,	O
the	O
kernel	B-Operating_System
socket	O
cleanup	O
code	O
will	O
by	O
its	O
own	O
initiative	O
issue	O
a	O
FIN/ERROR	O
message	O
to	O
the	O
peer	O
.	O
</s>
<s>
Group	O
messaging	O
is	O
similar	O
to	O
datagram	B-Protocol
messaging	O
,	O
as	O
described	O
above	O
,	O
but	O
with	O
end-to-end	O
flow	O
control	O
,	O
and	O
hence	O
with	O
delivery	O
guarantee	O
.	O
</s>
<s>
Before	O
Linux	B-Operating_System
4.17	O
,	O
nodes	O
must	O
be	O
configured	O
a	O
unique	O
32-bit	O
node	O
number	O
or	O
address	O
,	O
which	O
must	O
comply	O
with	O
certain	O
restrictions	O
.	O
</s>
<s>
As	O
from	O
Linux	B-Operating_System
4.17	O
,	O
each	O
node	O
has	O
a	O
128-bit	O
node	O
identity	O
which	O
must	O
be	O
unique	O
within	O
the	O
node	O
's	O
cluster	O
.	O
</s>
<s>
Neighbor	O
discovery	O
is	O
performed	O
by	O
UDP	B-Protocol
multicast	O
or	O
L2	O
broadcast	O
,	O
when	O
available	O
.	O
</s>
<s>
If	O
broadcast/multicast	O
support	O
is	O
missing	O
in	O
the	O
infrastructure	O
,	O
discovery	O
can	O
be	O
performed	O
by	O
explicitly	O
configured	O
IP	B-Protocol
addresses	O
.	O
</s>
<s>
Since	O
Linux	B-Operating_System
4.7	O
,	O
TIPC	O
comes	O
with	O
a	O
unique	O
,	O
patent	O
pending	O
,	O
auto-adaptive	O
hierarchical	O
neighbor	O
monitoring	O
algorithm	O
.	O
</s>
<s>
This	O
Overlapping	O
Ring	O
Monitoring	O
algorithm	O
,	O
in	O
reality	O
a	O
combination	O
of	O
ring	O
monitoring	O
and	O
the	O
Gossip	B-Operating_System
protocol	I-Operating_System
,	O
makes	O
it	O
possible	O
to	O
establish	O
full-mesh	O
clusters	O
of	O
up	O
to	O
1000	O
nodes	O
with	O
a	O
failure	O
discovery	O
time	O
of	O
1.5	O
seconds	O
,	O
while	O
it	O
in	O
smaller	O
clusters	O
can	O
be	O
made	O
much	O
shorter	O
.	O
</s>
<s>
While	O
designed	O
to	O
be	O
able	O
to	O
use	O
all	O
kinds	O
of	O
transport	O
media	O
,	O
implementations	O
support	O
UDP	B-Protocol
,	O
Ethernet	O
and	O
InfiniBand	B-Architecture
.	O
</s>
<s>
The	O
VxWorks	B-Operating_System
implementation	O
also	O
supports	O
shared	B-Operating_System
memory	I-Operating_System
which	O
can	O
be	O
accessed	O
by	O
multiple	O
instances	O
of	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
running	O
simultaneously	O
on	O
the	O
same	O
hardware	O
.	O
</s>
<s>
When	O
running	O
across	O
UDP	B-Protocol
,	O
IPSec	O
can	O
be	O
used	O
,	O
when	O
on	O
Ethernet	O
,	O
MACSec	O
is	O
the	O
best	O
option	O
.	O
</s>
<s>
This	O
protocol	O
was	O
originally	O
developed	O
by	O
Jon	O
Paul	O
Maloy	O
at	O
Ericsson	O
during	O
1996	O
–	O
2005	O
and	O
was	O
used	O
by	O
that	O
company	O
in	O
cluster	O
applications	O
for	O
several	O
years	O
,	O
before	O
subsequently	O
being	O
released	O
to	O
the	O
open	B-License
source	I-License
community	O
and	O
integrated	O
in	O
the	O
mainstream	O
Linux	B-Operating_System
kernel	I-Operating_System
.	O
</s>
<s>
The	O
management	O
tool	O
for	O
TIPC	O
is	O
part	O
of	O
the	O
iproute2	B-Protocol
tool	O
package	O
which	O
comes	O
as	O
standard	O
with	O
all	O
Linux	B-Operating_System
distributions	O
.	O
</s>
