rfc2765_4.1_nextheader.seq - Verify IPv6 <-> IPv4 header
translation in accordance with RFC2765 [SIIT]
Router
rfc2765_4.1_nextheader.seq [-tooloption ...]
-p rfc2765_4.1_nextheader.def
Before this test starts, run initialize.seq.
This test verifies that NUT can translates IPv6 Next Header field
to IPv4 Protocol field.
Network Topology
Link0
--------------------------
| |
TN NUT
| |
--------------------------
Link1
TN -- (Link0) -- NUT NUT -- (Link1) -- TN
--------------------- ------------------------
1.1.
===================>
ICMPv6 Echo Request
IPv6 Header
src address : TN LINK0 IPv4 embedded IPv6 address
dst address : TN LINK1 IPv4 embedded IPv6 address
Next Header = 58
ICMPv6 echo request
1.2.
<<JUDGMENT>>
===================>
ICMPv4 Echo request
IPv4 Header
src address : TN LINK0 IPv4 address
dst address : TN LINK1 IPv4 address
Don't Fragment = 1
Protocol = 1
ICMPv4 echo request
2.1.
<<JUDGMENT>>
===================>
IPv6 UDP packet
IPv6 Header
src address : TN LINK0 IPv4 embedded IPv6 address
dst address : TN LINK1 IPv4 embedded IPv6 address
Next Header = 17
UDP packet
Checksum including IPv6 pseudo header
data = repeat(0xff,64)
2.2.
===================>
IPv4 UDP packet
IPv4 Header
src address : TN LINK0 IPv4 address
dst address : TN LINK1 IPv4 address
Don't Fragment = 1
Protocol = 17
UDP packet
Checksum including IPv4 pseudo header
data = repeat(0xff,64)
3.1.
===================>
IPv6 UDP packet
IPv6 Header
src address : TN LINK0 IPv4 embedded IPv6 address
dst address : TN LINK1 IPv4 embedded IPv6 address
Next Header = 6
TCP packet
Checksum including IPv6 pseudo header
data = repeat(0xff,64)
3.2.
<<JUDGMENT>>
===================>
IPv4 TCP packet
IPv4 Header
src address : TN LINK0 IPv4 address
dst address : TN LINK1 IPv4 address
Don't Fragment = 1
Protocol = 6
TCP packet
Checksum including IPv4 pseudo header
data = repeat(0xff,64)
4.1.
===================>
IPv6 unknown protocol(255) packet
IPv6 Header
src address : TN LINK0 IPv4 embedded IPv6 address
dst address : TN LINK1 IPv4 embedded IPv6 address
Next Header = 255
data = repeat(0xff,64)
4.2.
<<JUDGMENT>>
===================>
IPv4 unknown protocol(255) packet
IPv4 Header
src address : TN LINK0 IPv4 address
dst address : TN LINK1 IPv4 address
Don't Fragment = 1
Protocol = 255
data = repeat(0xff,64)
<< PASS >>
NUT translates ICMPv6 to ICMPv4, recalculates header
checksum for UDP and TCP, and let other protocols
pass through unchanged.
<< FAIL >>
TN (Link0) does not receive an ICMPv4, an UDP, a TCP
and an IPv4 packet with Protocol = 255.
RFC2765
4.1. Translating IPv6 Headers into IPv4 Headers
If there is no IPv6 Fragment header the IPv4 header fields are set as follows:
Protocol:
Next Header field copied from IPv6 header.
perldoc V6evalTool