rfc2765_3.1_frag.seq - Verify IPv6 <-> IPv4 header
translation in accordance with RFC2765 [SIIT]
Router
rfc2765_3.1_frag.seq [-tooloption ...]
-p rfc2765_3.1_frag.def
Before this test starts, run initialize.seq.
This test verifies that NUT translated an IPv4 fragment
or IPv4 package with DF=0, to an IPv6 package with Fragment header.
Network Topology
Link0
--------------------------
| |
TN NUT
| |
--------------------------
Link1
TN -- (Link0) -- NUT NUT -- (Link1) -- TN
--------------------- ------------------------
1.1.
<===================
ICMPv4 Echo request
IPv4 Header
src address : TN LINK1 IPv4 address
dst address : TN LINK0 IPv4 address
Don't Fragment = 1
More fragments = 0
Offset = 0
ICMPv4 echo request
1.2.
<<JUDGMENT>>
<===================
ICMPv6 Echo Request
IPv6 Header
src address : TN LINK1 IPv4 embedded IPv6 address
dst address : TN LINK0 IPv4 embedded IPv6 address
NextHeader = 58
PayloadLength = 14
ICMPv6 echo request
2.1.[1-3]
<===================
ICMPv4 Echo request
IPv4 Header
src address : TN LINK1 IPv4 address
dst address : TN LINK0 IPv4 address
(DF,MF,Offset) = (0, 0, 0)
or (0, 1, 0)
or (1, 1, 0)
ICMPv4 echo request
2.2.[1-3]
<<JUDGMENT>>
<===================
ICMPv6 Echo Request
IPv6 Header
src address : TN LINK1 IPv4 embedded IPv6 address
dst address : TN LINK0 IPv4 embedded IPv6 address
NextHeader = 44
PayloadLength = 22
Fragment Header
More fragments = (0)
or (1)
or (1)
FragmentOffset = 0
ICMPv6 echo request
3.1.[1-4]
<===================
ICMPv4 Echo request
IPv4 Header
src address : TN LINK1 IPv4 address
dst address : TN LINK0 IPv4 address
(DF,MF,Offset) = (0, 0, 20)
or (1, 0, 20)
or (0, 1, 20)
or (1, 1, 20)
Payload data = ICMPv4 echo request
3.2.[1-4]
<<JUDGMENT>>
<===================
ICMPv6 Echo Request
IPv6 Header
src address : TN LINK1 IPv4 embedded IPv6 address
dst address : TN LINK0 IPv4 embedded IPv6 address
NextHeader = 44
PayloadLength = 22
Fragment Header
More fragments = (0)
or (0)
or (1)
or (1)
FragmentOffset = 20
Payload data = ICMPv4 echo request
<< PASS >>
NUT translates an IPv4 packages to IPv6 packages, including
Fragment header when needed.
<< FAIL >>
NUT fails the translation.
RFC2765
3.1. Translating IPv4 Headers into IPv6 Headers
If there is need to add a fragment header (the DF bit is not set or the packet is a fragment) the header fields are set as above with the following exceptions:
IPv6 fields:
Payload Length:
Total length value from IPv4 header, plus 8 for the
fragment header, minus the size of the IPv4 header
and IPv4 options, if present.
Next Header:
Fragment Header (44).
Fragment header fields:
Fragment Offset:
Fragment Offset copied from the IPv4 header.
M flag:
More Fragments bit copied from the IPv4 header.
perldoc V6evalTool