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From: Hideo Kuwabara <kuwa@superconnect.or.jp>
Date: Fri, 5 Mar 2021 16:11:46 +0900
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渡部と申します。

フレッツ光クロスを契約して,
JPNlE社の「v6プラス 固定IPサービス」に対応したISP(*1)と契約して,
FreeBSDを用いて,v4 over v6 IPoE接続によるインターネット接続を試みています。

(*1) https://www.jpne.co.jp/service/v6plus-static/

かなりネットの海を泳いだのですが,これと言った先行事例の記事が見つからず,
挫折しています。ただ,

https://people.allbsd.org/~hrs/FreeBSD/sato-FBSDW20170825.pdf

では,「gifトンネルでは大丈夫」(p.15)との記載があり,できるものだと信じていあす。

ところが,私はトンネルを張った接続を行ったことがなく,
何をどのようにしたらよいのか分かりません。

「教えて君」になってしまい申し訳ありませんが,
どなたか教えて頂けませんでしょうか。

●ISPからもらっている情報。

1. IPv6プレフィックス		:  aaaa : bbbb :cccc : dddd : eeee : ffff : gggg : hhhh / 56
2. IPv4アドレス		   	:  192. 168. 100. 119 / 32
3. インターフェースID	   	:  iiiii : jjjjj : kkkk : llll
4. Border Relay アドレス   	:  mmmm : nnnn : oooo : pp :: 65


●うちのネットワーク環境は下記のとおりです。

					+------------------+
192.168.131.64/27 ------| FreeBSD Router|-----ONU----NGN網----VNE(JPNE)----The Net
		  	  LAN1( .65 )---------LAN2(なし)


●ヤマハさんの設定事例集
http://www.rtpro.yamaha.co.jp/RT/docs/ipip/index.html#setting11

から,

LAN1のアドレスは「192.168.131.65」かつ,
「RAプロキシで取得したプレフィックス) : (インターフェイスID) / 64」になるようです。

# うちの回線はひかり電話未契約です。
 
どのようにネットワークの設定(とくに,IPIPトンネル(gif)を張ればよいか,
どうかご教示願います。

宜しくお願い致します。

---
渡部 岳郎(WATANABE, Takeo) / JA1CPJ
take@kasaneiro.jp

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From: Masahiro Tanaka <tanaka@airnet.ne.jp>
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Subject: [FreeBSD-users-jp 96704] Re: 
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こんにちは。田中と申します。

JPNE v6プラスは、MAP-E 対応が必要なため、小野様ご指摘のとおり難しいと
思います。

対して、v6プラス固定IP は、貰った v4アドレスをソースになるようにして
トンネルに入れるだけでいいので、gifトンネルとNATで対応できると思います。
(ややこしいのですが v6プラスと v6プラス固定IP は別物です)

> ●ISPからもらっている情報。
> 
> 1. IPv6プレフィックス		:  aaaa : bbbb :cccc : dddd : eeee : ffff : gggg : hhhh / 56
> 2. IPv4アドレス		   	:  192. 168. 100. 119 / 32
> 3. インターフェースID	   	:  iiiii : jjjjj : kkkk : llll
> 4. Border Relay アドレス   	:  mmmm : nnnn : oooo : pp :: 65

手元にあった環境(FreeBSD 10)で natd が使えなかったので
簡単な確認のみとなりますが以下のように通信確認が取れました。

# ifconfig xn0 inet6 <既に付いているIPv6アドレス> delete
# ifconfig xn0 inet6 fe80::iiii:jjjj:kkkk:llll prefixlen 64
# rtsol xn0

これで xn0 インタフェイスに
 inet6 fe80::iiii:jjjj:kkkk:llll prefixlen 64 scopeid 0x2
 inet6 aaaa:bbbb:cccc:dddd:iiii:jjjj:kkkk:llll prefixlen 64 autoconf
のようなアドレスが付くと思います。

続けて JPNE のトンネル終端ルータあてに IPIP トンネルを張ります。
# ifconfig gif0 create inet6 tunnel aaaa:bbbb:cccc:dddd:iiii:jjjj:kkkk:llll mmmm:nnnn:oooo:pp::65
# ifconfig gif0 up

あとは、外向けのパケットを ISP からもらっている IPv4アドレス
に NAT して、トンネルに入れてやれば通信できるはずです。


手元で natd が動かせる環境がなかったので、とりあえず、
以下のように無理矢理ソースIPアドレスをISP払い出しアドレスにして
試してみました。

# route del -inet default
# route add -inet default -interface gif0
# ifconfig xn0 inet 192.168.100.119 netmask 255.255.255.255 alias
# ping -S 192.168.100.119 8.8.8.8
PING 8.8.8.8 (8.8.8.8) from 192.168.100.119: 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=117 time=9.402 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=117 time=9.667 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 9.402/9.534/9.667/0.132 ms


上記はあくまで v6プラス固定IP の仕様にあわせて無理矢理
設定をしてみたもので、正しい設定方法とは異なると思います。

また、natd の設定や、再起動後の設定の保持方法などは、どなたか
詳しい方にフォローいただければありがたいです。

よろしくお願い致します。

-- Masahiro Tanaka
e-mail: tanaka@airnet.ne.jp


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Subject: [FreeBSD-users-jp 96705] Re: 
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渡部です。
お世話になります。

on Sat, 6 Mar 2021 05:01:44 +0900
Hiroo Ono (小野寛生) <hiroo.ono+freebsd@gmail.com> wrote: 

> 小野寛生です。
> 
> 結論から言うと、残念ですが FreeBSD では実用上無理です。
> 
> 2021年3月5日(金) 23:51 WATANABE Takeo <take@kasaneiro.jp>:
>>
>> 渡部と申します。
>>
>> フレッツ光クロスを契約して,
>> JPNlE社の「v6プラス 固定IPサービス」に対応したISP(*1)と契約して,
>> FreeBSDを用いて,v4 over v6 IPoE接続によるインターネット接続を試みています。
>>
>> (*1) https://www.jpne.co.jp/service/v6plus-static/
>>
>> かなりネットの海を泳いだのですが,これと言った先行事例の記事が見つからず,
>> 挫折しています。ただ,
>>
>> https://people.allbsd.org/~hrs/FreeBSD/sato-FBSDW20170825.pdf
>>
>> では,「gifトンネルでは大丈夫」(p.15)との記載があり,できるものだと信じていあす。
> 
> その資料には同じく「MAP-E には非対応」とあるかと思いますが、V6プラスで提供されているのは
> MAP-E 方式です。
> 参考: https://www.slideshare.net/yuyarin/i-pv4-ipv6coexistance


今回,私が使おうとしているのは「v6プラス」ではなく,
「v6プラス 固定IPサービス」です。

JPNE社が監修している書籍

ラムダノート(株)刊行の
「徹底解説v6プラス」(著者: 小川晃通 氏,久保田聡 氏,2020年初版)
の6.3 節(p. 83) では,

「固定IPサービスでは,v4 over v6 トンネルとして,MAP-Eを利用しない」
旨が書かれており,トンネリングの設定できれば,利用可能かと思ったのですが,
違うのでしょうか。

---
渡部 岳郎(WATANABE, Takeo) / JA1CPJ
take@kasaneiro.jp

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渡部です。
たびたび,すみません。

on Sat, 06 Mar 2021 16:38:10 +0900
Masahiro Tanaka <tanaka@airnet.ne.jp> wrote: 

> こんにちは。田中と申します。
> 
> JPNE v6プラスは、MAP-E 対応が必要なため、小野様ご指摘のとおり難しいと
> 思います。
> 
> 対して、v6プラス固定IP は、貰った v4アドレスをソースになるようにして
> トンネルに入れるだけでいいので、gifトンネルとNATで対応できると思います。
> (ややこしいのですが v6プラスと v6プラス固定IP は別物です)

先程の私のメールと内容がかぶってしまいました。
失礼しました。


>> ●ISPからもらっている情報。
>> 
>> 1. IPv6プレフィックス		:  aaaa : bbbb :cccc : dddd : eeee : ffff : gggg : hhhh / 56
>> 2. IPv4アドレス		   	:  192. 168. 100. 119 / 32
>> 3. インターフェースID	   	:  iiiii : jjjjj : kkkk : llll
>> 4. Border Relay アドレス   	:  mmmm : nnnn : oooo : pp :: 65
> 
> 手元にあった環境(FreeBSD 10)で natd が使えなかったので
> 簡単な確認のみとなりますが以下のように通信確認が取れました。
> 
> # ifconfig xn0 inet6 <既に付いているIPv6アドレス> delete
> # ifconfig xn0 inet6 fe80::iiii:jjjj:kkkk:llll prefixlen 64
> # rtsol xn0

xn0 とは,WAN(ONU)側のインターフェイスでしょうか?

私はそう仮定してここまでを実行したところ,

# rtsol ixl0
rtsol: ixl0 does not accept Router Advertisement.

というエラーが出てしまいました。

ixl0 インターフェイスには,

inet6 fe80::iiii:jjjj:kkkk:llll.0%ixl0  prefixlen 64 scopeid 0x1

というアドレスが付きました。

これはどのように解消したらよろしいのでしょうか?

---
渡部 岳郎(WATANABE, Takeo) / JA1CPJ
take@kasaneiro.jp