pmtuStore - Verify if NUT can store PMTU for multiple Destinations.
Host
pmtuStore.seq [-tooloption ...] -p pmtuStore.def
This test evaluate the behavior of NUT when it receive the ICMP
Packet Too Big Message for multiple destinations.
In this test, NUT is a host and TN plays a Roll of Routers and
other hosts.
Phisical Network configuration
--------+---------------+----------
| |
NUT TN
Logical Network Configuration
NUT
|
----------------+-------+--------
|
Router-1
|
--------+-------+-------+--------
| |
Router-2 HOST-1
|
--------+-------+-------+--------
| |
Router-n HOST-2
|
----------------+-------+--------
|
HOST-n
:
:
In this test, NUT receives Packet Too Big Messages for multiple
destinations.
- Register PMTU for multiple HOST
- Verify PMTU for multiple HOST
The TN send a RA to assign global address prefix.
TN NUT
| |
---+------------+------
===multicast RA===>
src=TN's link-local
dst=LinkLocal-all-node
M=0, O=0,
Lifetime=3600, ReachableTime=60000, RetransTimer=1005
Prefix:
L=1, A=1,
ValidLifetime=3600005, PreferredLifetime=3600005
Prefix=3ffe:501:ffff:100::, PrefixLength=64
Wait (5 sec.)
Ignoring DAD packets for global address.
"pmtuStore" verify NUT's behavior when it receives
ICMP Packet Too Big Mesg for multiple destinations.
TN NUT
| |
---+------------+------
1. Register PMTU for multiple destinations
1.1
TN send Echo Request.
TN(n) === echo request(1500) ===> NUT
1.2
NUT send Echo Reply.
TN(n) <=== echo reply(1500) === NUT
1.3
TN send ICMPv6 Too Big Mesg with MTU (1280+n*8).
TN(n) === ICMPv6 Too Big Mesg(MTU=1280+n*8) ===> NUT
2. Confirm PMTU for multiple destinations
2.1
TN send Echo Request.
TN(n) === echo request(1500) ===> NUT
2.2
NUT send Echo Reply
<< JUDGMENT 1 >>
TN(n) <=== echo reply(1280+n*8 1/2) === NUT
TN(n) <=== echo reply( 276-n*8 2/2) === NUT
<< JUDGMENT 1 -PASS- >>
NUT send Echo Reply
"PASS" means that NUT set valid MTU in received Packet Too Big message for multiple destinations.
And fragmented packets are correct.
perldoc V6evalTool
perldoc V6evalRemote