日本語で勉強できる!CCIE R&S ワークブック ラボ#02 Troubleshoot サンプル
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ネットワーク構成
Trouble Ticket01
問題
R7-R9間のPPPリンクが正常にUpしません。PPPリンクを正常に利用できるようにし、以下のshowコマンドの出力が得られるようにしてください。ただし、R9で明示的にデフォルトルートをスタティックルートとして設定してはいけません。
R9
------------------------------------------- R9#show interfaces serial 1/0 Serial1/0 is up, line protocol is up Hardware is M4T Internet address is 10.7.9.9/32 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open Open: IPCP, CDPCP, crc 16, loopback not set ~省略~ R9#show ip int brief Interface IP-Address OK? Method Status Protocol ~省略~ Serial1/0 10.7.9.90 YES IPCP up up ~省略~ R9#show ip route 0.0.0.0 Routing entry for 0.0.0.0/0, supernet Known via "static", distance 1, metric 0, candidate default path Routing Descriptor Blocks: * 10.7.9.7 Route metric is 0, traffic share count is 1 R9#ping 172.31.4.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.31.4.4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 9/9/9 ms -------------------------------------------
あるべき正常な状態
- R7-R9間のPPPリンクがup/upになっている
CHAP認証が正常に行われている。CHAP認証ではお互いのパスワードが一致していなければならない - R9 S1/0でIPCPによってIPアドレス10.7.9.9/32が割り当てられている
IPアドレスを割り当てる側
(config-if)#peer default ip address
IPアドレスを割り当てられる側
(config-if)#ip address negotiated - R9のルーティングテーブルにIPCPによるデフォルトルートが登録されている
(config-if)#ppp ipcp route default
トラブルシュート
Step1:PPPインタフェースの確認
まず、R9のPPPインタフェースの状態を確認します。
R9
------------------------------------------- R9#show interfaces serial 1/0 Serial1/0 is up, line protocol is down Hardware is M4T Internet address will be negotiated using IPCP MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Closed, crc 16, loopback not set ~省略~ -------------------------------------------
R9のPPPインタフェース(Se1/0)はup/downの状態です。PPPインタフェースがup/downとなる最も考えられる原因としては、認証が正常にできていないことです。
Step2:CHAP認証の確認
R9でdebug ppp authenticationを有効にして認証の様子を確認します。
R9
------------------------------------------- R9#debug ppp authentication PPP authentication debugging is on R9#conf t *Apr 7 14:20:33.915: Se1/0 PPP: Using default call direction *Apr 7 14:20:33.915: Se1/0 PPP: Treating connection as a dedicated line *Apr 7 14:20:33.915: Se1/0 PPP: Session handle[62000078] Session id[120] *Apr 7 14:20:33.942: Se1/0 CHAP: O CHALLENGE id 1 len 23 from "R9" *Apr 7 14:20:33.942: Se1/0 CHAP: I CHALLENGE id 1 len 23 from "R7" *Apr 7 14:20:33.942: Se1/0 PPP: Sent CHAP SENDAUTH Request *Apr 7 14:20:33.942: Se1/0 PPP: Received SENDAUTH Response PASS *Apr 7 14:20:33.942: Se1/0 CHAP: Using hostname from configured hostname *Apr 7 14:20:33.942: Se1/0 CHAP: Using password from AAA *Apr 7 14:20:33.942: Se1/0 CHAP: O RESPONSE id 1 len 23 from "R9" *Apr 7 14:20:33.947: Se1/0 CHAP: I RESPONSE id 1 len 23 from "R7" *Apr 7 14:20:33.947: Se1/0 PPP: Sent CHAP LOGIN Request *Apr 7 14:20:33.947: Se1/0 PPP: Received LOGIN Response FAIL *Apr 7 14:20:33.947: Se1/0 CHAP: O FAILURE id 1 len 25 msg is "Authentication failed" -------------------------------------------
認証が失敗してしまっていることが確認できます。そこで、R7とR9でPPPの認証に関する設定を確認します。
R7
------------------------------------------- R7#show running-config interface se 1/2 Building configuration... Current configuration : 165 bytes ! interface Serial1/2 ip address 10.7.9.7 255.255.255.0 encapsulation ppp peer default ip address 10.7.9.90 ppp authentication chap serial restart-delay 0 end R7#show run | include username username R6-PAP password 0 Csco username cisco privilege 15 password 0 cisco username R9 password 0 cisco ppp pap sent-username R7-PAP password 0 Csco -------------------------------------------
R9
------------------------------------------- R9#show running-config interface se 1/0 Building configuration... Current configuration : 118 bytes ! interface Serial1/0 ip address negotiated encapsulation ppp ppp authentication chap serial restart-delay 0 end R9#show run | include username username cisco privilege 15 password 0 cisco username R7 password 0 c1sco -------------------------------------------
R7とR9でCHAP認証に利用するパスワードが一致していません。お互いのホスト名に対するパスワードとして、R7では「cisco」、R9では「c1sco」が設定されています。
Step3:CHAP認証パスワードの修正
CHAP認証のパスワードがR7とR9で一致するように設定を修正します。ここでは、R9でR7と同じ「cisco」を利用するようにします。
※R7で「c1sco」としても問題ありません。
R9
------------------------------------------- username R7 password 0 cisco -------------------------------------------
Step4:PPPインタフェースの確認
R9のSe1/0がup/upとなっていることを確認します。
R9
------------------------------------------- R9#show interfaces se 1/0 Serial1/0 is up, line protocol is up Hardware is M4T Internet address is 10.7.9.90/32 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open Open: IPCP, CDPCP, crc 16, loopback not set ~省略~ -------------------------------------------
R9 Se1/0がup/upとなっているので、CHAP認証が正常にできていることがわかります。
Step5:IPCPによるIPアドレス割り当ての確認
R9 Se1/0はup/upになっているものの、IPアドレスが問題の条件とは異なっています。本来は、10.7.9.9/32がIPCPで自動的に割り当てられるはずですが、10.7.9.90/32となっています。
R9
------------------------------------------- R9#show ip interface brief Interface IP-Address OK? Method Status Protocol Ethernet0/0 unassigned YES unset administratively down down Ethernet0/1 unassigned YES unset administratively down down Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 10.7.9.90 YES IPCP up up Serial1/1 unassigned YES unset administratively down down Serial1/2 unassigned YES unset administratively down down Serial1/3 unassigned YES unset administratively down down Loopback0 172.31.5.5 YES manual up up Tunnel0 10.7.0.9 YES manual up up -------------------------------------------
IPCPによるIPアドレスの割り当てを確認するために、R9でdebug ppp negotiationを有効にして、Se1/0をshutdown→no shutdownすると、次のようになります。
R9
------------------------------------------- R9#debug ppp negotiation PPP protocol negotiation debugging is on R9#conf t Enter configuration commands, one per line. End with CNTL/Z. R9(config)#int se 1/0 R9(config-if)#shutdown R9(config-if)# *Apr 7 14:36:04.687: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to down *Apr 7 14:36:04.687: %LINK-5-CHANGED: Interface Serial1/0, changed state to administratively down *Apr 7 14:36:04.687: Se1/0 PPP: Sending cstate DOWN notification *Apr 7 14:36:04.687: Se1/0 PPP: Processing CstateDown message *Apr 7 14:36:04.687: Se1/0 PPP DISC: Lower Layer disconnected *Apr 7 14:36:04.687: PPP: NET STOP send to AAA. *Apr 7 14:36:04.687: Se1/0 IPCP: Event[DOWN] State[Open to Starting] *Apr 7 14:36:04.687: Se1/0 IPCP: Event[CLOSE] State[Starting to Initial] *Apr 7 14:36:04.687: Se1/0 CDPCP: Event[DOWN] State[Open to Starting] *Apr 7 14:36:04.687: Se1/0 CDPCP: Event[CLOSE] State[Starting to Initial] *Apr 7 14:36:04.687: Se1/0 LCP: O TERMREQ [Open] id 2 len 4 *Apr 7 14:36:04.687: Se1/0 LCP: Event[CLOSE] State[Open to Closing] *Apr 7 14:36:04.687: Se1/0 PPP: Phase is TERMINATING *Apr 7 14:36:04.687: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to down *Apr 7 14:36:04.688: Se1/0 Deleted neighbor route from AVL tree: topoid 0, address 10.7.9.7 *Apr 7 14:36:04.688: Se1/0 IPCP: Remove route to 10.7.9.7 *Apr 7 14:36:04.688: Se1/0 LCP: Event[DOWN] State[Closing to Initial] *Apr 7 14:36:04.688: Se1/0 PPP: Phase is DOWN R9(config-if)#no shutdown R9(config-if)# *Apr 7 14:36:09.629: %LINK-3-UPDOWN: Interface Serial1/0, changed state to up *Apr 7 14:36:09.629: Se1/0 PPP: Sending cstate UP notification *Apr 7 14:36:09.629: Se1/0 PPP: Processing CstateUp message *Apr 7 14:36:09.629: PPP: Alloc Context [2580FE4] *Apr 7 14:36:09.629: ppp374 PPP: Phase is ESTABLISHING *Apr 7 14:36:09.629: Se1/0 PPP: Using default call direction *Apr 7 14:36:09.630: Se1/0 PPP: Treating connection as a dedicated line *Apr 7 14:36:09.630: Se1/0 PPP: Session handle[F1000176] Session id[374] *Apr 7 14:36:09.630: Se1/0 LCP: Event[OPEN] State[Initial to Starting] *Apr 7 14:36:09.630: Se1/0 LCP: O CONFREQ [Starting] id 1 len 15 *Apr 7 14:36:09.630: Se1/0 LCP: AuthProto CHAP (0x0305C22305) *Apr 7 14:36:09.630: Se1/0 LCP: MagicNumber 0xBE6D5E5B (0x0506BE6D5E5B) *Apr 7 14:36:09.630: Se1/0 LCP: Event[UP] State[Starting to REQsent] *Apr 7 14:36:09.637: Se1/0 LCP: I CONFREQ [REQsent] id 1 len 15 *Apr 7 14:36:09.637: Se1/0 LCP: AuthProto CHAP (0x0305C22305) *Apr 7 14:36:09.637: Se1/0 LCP: MagicNumber 0xBE6D6006 (0x0506BE6D6006) *Apr 7 14:36:09.637: Se1/0 LCP: O CONFACK [REQsent] id 1 len 15 *Apr 7 14:36:09.637: Se1/0 LCP: AuthProto CHAP (0x0305C22305) *Apr 7 14:36:09.637: Se1/0 LCP: MagicNumber 0xBE6D6006 (0x0506BE6D6006) *Apr 7 14:36:09.637: Se1/0 LCP: Event[Receive ConfReq+] State[REQsent to ACKsent] *Apr 7 14:36:09.641: Se1/0 LCP: I CONFACK [ACKsent] id 1 len 15 *Apr 7 14:36:09.641: Se1/0 LCP: AuthProto CHAP (0x0305C22305) *Apr 7 14:36:09.641: Se1/0 LCP: MagicNumber 0xBE6D5E5B (0x0506BE6D5E5B) *Apr 7 14:36:09.641: Se1/0 LCP: Event[Receive ConfAck] State[ACKsent to Open] *Apr 7 14:36:09.650: Se1/0 PPP: Phase is AUTHENTICATING, by both *Apr 7 14:36:09.650: Se1/0 CHAP: O CHALLENGE id 1 len 23 from "R9" *Apr 7 14:36:09.650: Se1/0 LCP: State is Open *Apr 7 14:36:09.681: Se1/0 CHAP: I CHALLENGE id 1 len 23 from "R7" *Apr 7 14:36:09.681: Se1/0 CHAP: I RESPONSE id 1 len 23 from "R7" *Apr 7 14:36:09.681: Se1/0 PPP: Phase is FORWARDING, Attempting Forward *Apr 7 14:36:09.681: Se1/0 PPP: Phase is AUTHENTICATING, Unauthenticated User *Apr 7 14:36:09.681: Se1/0 CHAP: Using hostname from configured hostname *Apr 7 14:36:09.681: Se1/0 CHAP: Using password from AAA *Apr 7 14:36:09.681: Se1/0 CHAP: O RESPONSE id 1 len 23 from "R9" *Apr 7 14:36:09.681: Se1/0 IPCP: Authorizing CP *Apr 7 14:36:09.681: Se1/0 IPCP: CP stalled on event[Authorize CP] *Apr 7 14:36:09.682: Se1/0 IPCP: CP unstall *Apr 7 14:36:09.682: Se1/0 PPP: Phase is FORWARDING, Attempting Forward *Apr 7 14:36:09.686: Se1/0 PPP: Phase is AUTHENTICATING, Authenticated User *Apr 7 14:36:09.686: Se1/0 CHAP: O SUCCESS id 1 len 4 *Apr 7 14:36:09.691: Se1/0 CHAP: I SUCCESS id 1 len 4 *Apr 7 14:36:09.691: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to up *Apr 7 14:36:09.691: Se1/0 PPP: Phase is UP *Apr 7 14:36:09.691: Se1/0 IPCP: Protocol configured, start CP. state[Initial] *Apr 7 14:36:09.691: Se1/0 IPCP: Event[OPEN] State[Initial to Starting] *Apr 7 14:36:09.691: Se1/0 IPCP: O CONFREQ [Starting] id 1 len 10 *Apr 7 14:36:09.691: Se1/0 IPCP: Address 0.0.0.0 (0x030600000000) *Apr 7 14:36:09.691: Se1/0 IPCP: Event[UP] State[Starting to REQsent] *Apr 7 14:36:09.691: Se1/0 CDPCP: Protocol configured, start CP. state[Initial] *Apr 7 14:36:09.691: Se1/0 CDPCP: Event[OPEN] State[Initial to Starting] *Apr 7 14:36:09.691: Se1/0 CDPCP: Authorizing CP *Apr 7 14:36:09.691: Se1/0 CDPCP: CP stalled on event[Authorize CP] *Apr 7 14:36:09.692: Se1/0 IPCP: I CONFREQ [REQsent] id 1 len 10 *Apr 7 14:36:09.692: Se1/0 IPCP: Address 10.7.9.7 (0x03060A070907) *Apr 7 14:36:09.692: Se1/0 IPCP AUTHOR: Start. Her address 10.7.9.7, we want 0.0.0.0 *Apr 7 14:36:09.692: Se1/0 IPCP AUTHOR: Reject 10.7.9.7, using 0.0.0.0 *Apr 7 14:36:09.692: Se1/0 IPCP AUTHOR: Done. Her address 10.7.9.7, we want 0.0.0.0 *Apr 7 14:36:09.692: Se1/0 IPCP: O CONFACK [REQsent] id 1 len 10 *Apr 7 14:36:09.692: Se1/0 IPCP: Address 10.7.9.7 (0x03060A070907) *Apr 7 14:36:09.692: Se1/0 IPCP: Event[Receive ConfReq+] State[REQsent to ACKsent] *Apr 7 14:36:09.692: Se1/0 CDPCP: CP unstall *Apr 7 14:36:09.692: Se1/0 CDPCP: O CONFREQ [Starting] id 1 len 4 *Apr 7 14:36:09.692: Se1/0 CDPCP: Event[UP] State[Starting to REQsent] *Apr 7 14:36:09.692: Se1/0 IPCP: I CONFNAK [ACKsent] id 1 len 10 *Apr 7 14:36:09.692: Se1/0 IPCP: Address 10.7.9.90 (0x03060A07095A) *Apr 7 14:36:09.692: Se1/0 IPCP: O CONFREQ [ACKsent] id 2 len 10 *Apr 7 14:36:09.692: Se1/0 IPCP: Address 10.7.9.90 (0x03060A07095A) *Apr 7 14:36:09.692: Se1/0 IPCP: Event[Receive ConfNak/Rej] State[ACKsent to ACKsent] *Apr 7 14:36:09.692: Se1/0 CDPCP: I CONFREQ [REQsent] id 1 len 4 *Apr 7 14:36:09.692: Se1/0 CDPCP: O CONFACK [REQsent] id 1 len 4 *Apr 7 14:36:09.692: Se1/0 CDPCP: Event[Receive ConfReq+] State[REQsent to ACKsent] *Apr 7 14:36:09.696: Se1/0 CDPCP: I CONFACK [ACKsent] id 1 len 4 *Apr 7 14:36:09.696: Se1/0 CDPCP: Event[Receive ConfAck] State[ACKsent to Open] *Apr 7 14:36:09.701: Se1/0 IPCP: I CONFACK [ACKsent] id 2 len 10 *Apr 7 14:36:09.701: Se1/0 IPCP: Address 10.7.9.90 (0x03060A07095A) *Apr 7 14:36:09.701: Se1/0 IPCP: Event[Receive ConfAck] State[ACKsent to Open] *Apr 7 14:36:09.715: Se1/0 CDPCP: State is Open *Apr 7 14:36:09.715: Se1/0 IPCP: State is Open *Apr 7 14:36:09.715: Se1/0 IPCP: Install negotiated IP interface address 10.7.9.90 *Apr 7 14:36:09.715: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up R9(config-if)# *Apr 7 14:36:09.716: Se1/0 Added to neighbor route AVL tree: topoid 0, address 10.7.9.7 *Apr 7 14:36:09.716: Se1/0 IPCP: Install route to 10.7.9.7 R9(config-if)#do u all All possible debugging has been turned off R9(config-if)# -------------------------------------------
IPCPでR9 Se1/0に対して10.7.9.90が割り当てられていることがわかります。これは、R7側でIPCPによって割り当てるIPアドレスの設定が間違っていることが考えられます。そこで、R7 S1/0の設定を確認します。
R7
------------------------------------------- R7#show run int se 1/2 Building configuration... Current configuration : 165 bytes ! interface Serial1/2 ip address 10.7.9.7 255.255.255.0 encapsulation ppp peer default ip address 10.7.9.90 ppp authentication chap serial restart-delay 0 end -------------------------------------------
Step6:IPCPで割り当てるIPアドレスの修正
R7側でIPCPによって割り当てるIPアドレスを正しいアドレスである10.7.9.9に修正します。
R7
------------------------------------------- interface Serial1/2 peer default ip address 10.7.9.9 -------------------------------------------
Step7:R9 Se1/0のIPアドレスの確認
R9 Se1/0に正しいIPアドレスが割り当てられるようになっていることを確認します。いったん、R9 Se1/0をshutdown→no shutdownしてIPアドレスを確認します。
R9
------------------------------------------- R9(config)#interface serial 1/0 R9(config-if)#shutdown R9(config-if)# *Apr 7 14:44:04.870: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to down *Apr 7 14:44:06.632: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to down *Apr 7 14:44:06.632: %LINK-5-CHANGED: Interface Serial1/0, changed state to administratively down R9(config-if)#no shutdown R9(config-if)# *Apr 7 14:44:11.883: %LINK-3-UPDOWN: Interface Serial1/0, changed state to up R9(config-if)# *Apr 7 14:44:11.936: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to up *Apr 7 14:44:11.955: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up R9(config-if)#do show ip int brief Interface IP-Address OK? Method Status Protocol Ethernet0/0 unassigned YES unset administratively down down Ethernet0/1 unassigned YES unset administratively down down Ethernet0/2 unassigned YES unset administratively down down Ethernet0/3 unassigned YES unset administratively down down Serial1/0 10.7.9.9 YES IPCP up up Serial1/1 unassigned YES unset administratively down down Serial1/2 unassigned YES unset administratively down down Serial1/3 unassigned YES unset administratively down down Loopback0 172.31.5.5 YES manual up up Tunnel0 10.7.0.9 YES manual up up -------------------------------------------
Step8:ルーティングテーブルの確認
条件より、R9のルーティングテーブルにはデフォルトルートが登録されている必要があります。R9のルーティングテーブルを確認します。
R9
------------------------------------------- R9#show ip route 0.0.0.0 % Network not in table -------------------------------------------
R9のルーティングテーブルには、デフォルトルートは登録されていません。条件のshowコマンドの出力では、スタティックルートとしてデフォルトルートが登録されています。しかし、明示的なスタティックルートの設定は禁止されています。
PPPのIPCPによって対向のIPアドレスをネクストホップとするデフォルトルートをルーティングテーブルに登録できます。この問題の条件はIPCPによるデフォルトルートの登録を想定していると考えられます。そこで、R9 Se1/0の設定を確認します。
R9
------------------------------------------- R9#show run interface se 1/0 Building configuration... Current configuration : 118 bytes ! interface Serial1/0 ip address negotiated encapsulation ppp ppp authentication chap serial restart-delay 0 end -------------------------------------------
R9のSe1/0にはPPP IPCPによるデフォルトルートの設定がされていないことがわかります。
Step9:R9 デフォルトルートの設定
R9のルーティングテーブルにIPCPによるデフォルトルートを登録するために、Se1/0でppp ipcp route defaultコマンドを入力します。
R9
------------------------------------------- interface Serial1/0 ppp ipcp route default -------------------------------------------
Step10:R9 ルーティングテーブルの確認
R9のルーティングテーブルにIPCPによってデフォルトルートが登録されていることを確認します。
R9
------------------------------------------- R9#debug ppp negotiation PPP protocol negotiation debugging is on R9#clear ip route * R9# *Apr 8 01:21:28.593: PPP: Repopulate neighbor route Req-type 0 Topoid 0 Address 0.0.0.0 *Apr 8 01:21:28.593: Se1/0 Neighbor route repopulate ALL: topoid 0, address 10.7.9.7 *Apr 8 01:21:28.598: Se1/0 IPCP: Install default route thru 10.7.9.7 *Apr 8 01:21:28.598: Se1/0 Unable to add neighbor route to AVL tree:topoid 0, address 10.7.9.7 *Apr 8 01:21:28.598: Se1/0 IPCP: Route not installed to 10.7.9.7R9#show ip route 0.0.0.0 Routing entry for 0.0.0.0/0, supernet Known via "static", distance 1, metric 0, candidate default path Routing Descriptor Blocks: * 10.7.9.7 Route metric is 0, traffic share count is 1 -------------------------------------------
Step11:トラブルシュート完了の確認
すべての設定ミスの修正が完了して、問題の条件通りのshowコマンドの出力となることを確認します。
R9
------------------------------------------- R9#show interfaces serial 1/0 Serial1/0 is up, line protocol is up Hardware is M4T Internet address is 10.7.9.9/32 MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation PPP, LCP Open Open: IPCP, CDPCP, crc 16, loopback not set ~省略~ R9#show ip int brief Interface IP-Address OK? Method Status Protocol ~省略~ Serial1/0 10.7.9.90 YES IPCP up up ~省略~ R9#show ip route 0.0.0.0 Routing entry for 0.0.0.0/0, supernet Known via "static", distance 1, metric 0, candidate default path Routing Descriptor Blocks: * 10.7.9.7 Route metric is 0, traffic share count is 1 R9#ping 172.31.4.4 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.31.4.4, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 9/9/9 ms -------------------------------------------
設定ミスのまとめ
Trouble Ticket01には、以下の3つの設定ミスがあります。
- R7
peer default ip addressコマンドの設定が間違っている - R9
CHAP認証で利用するパスワードの設定が間違っている
ppp ipcp route defaultコマンドが抜けている
TroubleTicket01についての動画解説をYoutubeで公開しています。
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