Re: Making Gnutella "IPv6-Ready"
Jeroen Asselman <[email protected]> Wed, 10 Aug 2011 17:55:09 +0200
| Newsgroups | gmane.network.gnutella.devel |
|---|---|
| Message-ID | <[email protected]> |
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Hello,
From the June 24nd, 2011 specification:
> - "IP/6.0" indicates that the servent has both IPv4 and IPv6 connectivity=
.
> It can accept IPv6 and IPv4 addresses, so one should send back "ALT" or
> "ALT6" extensions in query hits for instance, or freely mix IPv4 and
> IPv6 addresses in X-Push-Proxies or in X-Try-Ultrapeers headers.
>=20
> - "IP/6.4" indicates that the servent has only IPv6 connectivity and does
> not support IPv4 at all. There should only be IPv6 addresses given in
> X-Alt headers for instance, including IPv4 being a waste as the servent
> will have no way to validate these alternate locations.
I find the naming confusing. Without reading the description I would say "I=
P/6.0" is IPv6 only. and "IP/6.4" having both 6 and 4. When reading the des=
criptions I find the feature names counter intuitive.
> 5.4 Ping
>=20
> The "SCP" payload is extended to include two new flags:
>=20
> 0x4 Node also wants IPv6 addresses
> 0x8 Node does not want any IPv4
>=20
> These flags govern whether "IPP" or "IPP6" (or both) will be sent back.
> Legacy servents will not supply any of these flags and will therefore
> only get back "IPP" in their pongs.
What would be the suggested behaviour when 0x4 is not set, but 0x8 is? Futu=
re reservation?
> 5.5 Queries and HEAD Ping
>=20
> Gnutella queries and HEAD Ping request must include an empty "I6" GGEP
> extension to advertise that they can accept IPv6 addresses. If they
> can only accept IPv6, then they must include a 1 byte payload with the
> value 1.
What should clients do when another value is read. Say 3, read it as a bit =
flag and having bit 1 set indicate a IPv6 only?
There is something what worries me, although I am not sure it is a problem,=
suppose the following situation:
Node A [IPv4 only]=20
||
Node B [IPv4 & 6]
||
Node C [IPv6 only]=20
||
Node D [IPv4 & 6]=20
||
Node E [IPv4 only]
As IPv6 only nodes won't include an IPv4 addresses, wouldn't this raise the=
possibility of IPv4 islands?
- Jeroen
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<p>Hello,<br>
<br>
From the June 24nd, 2011 specification:<br>
<br>
> - "IP/6.0" indicates that the servent has both IPv4 and IPv6 connectivity.<br>
> It can accept IPv6 and IPv4 addresses, so one should send back "ALT" or<br>
> "ALT6" extensions in query hits for instance, or freely mix IPv4 and<br>
> IPv6 addresses in X-Push-Proxies or in X-Try-Ultrapeers headers.<br>
> <br>
> - "IP/6.4" indicates that the servent has only IPv6 connectivity and does<br>
> not support IPv4 at all. There should only be IPv6 addresses given in<br>
> X-Alt headers for instance, including IPv4 being a waste as the servent<br>
> will have no way to validate these alternate locations.<br>
<br>
I find the naming confusing. Without reading the description I would say "IP/6.0" is IPv6 only. and "IP/6.4" having both 6 and 4. When reading the descriptions I find the feature names counter intuitive.<br>
<br>
> 5.4 Ping<br>
> <br>
> The "SCP" payload is extended to include two new flags:<br>
> <br>
> 0x4 Node also wants IPv6 addresses<br>
> 0x8 Node does not want any IPv4<br>
> <br>
> These flags govern whether "IPP" or "IPP6" (or both) will be sent back.<br>
> Legacy servents will not supply any of these flags and will therefore<br>
> only get back "IPP" in their pongs.<br>
<br>
What would be the suggested behaviour when 0x4 is not set, but 0x8 is? Future reservation?<br>
<br>
> 5.5 Queries and HEAD Ping<br>
> <br>
> Gnutella queries and HEAD Ping request must include an empty "I6" GGEP<br>
> extension to advertise that they can accept IPv6 addresses. If they<br>
> can only accept IPv6, then they must include a 1 byte payload with the<br>
> value 1.<br>
<br>
What should clients do when another value is read. Say 3, read it as a bit flag and having bit 1 set indicate a IPv6 only?<br>
<br>
There is something what worries me, although I am not sure it is a problem, suppose the following situation:<br>
<br>
Node A [IPv4 only] <br>
||<br>
Node B [IPv4 & 6]<br>
||<br>
Node C [IPv6 only] <br>
||<br>
Node D [IPv4 & 6] <br>
||<br>
Node E [IPv4 only]<br>
<br>
As IPv6 only nodes won't include an IPv4 addresses, wouldn't this raise the possibility of IPv4 islands?<br>
<br>
- Jeroen</p>
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