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@jp_yen(切手 一円)

Cisco ルータで pppoe サーバーになる (Dynamic IP-1)

Last updated at Posted at 2024-01-01

Cisco ルーターで pppoe サーバーを作成する

image.png

セグメント
pppoe サーバ 172.31.0.0/31
Center 172.31.255.x/24
Site-x 172.31.254.x/24
  1. Site-x をダイナミック IP で設定する (Dynamic IP-1)
  2. Center を別セグメントのダイナミック IP で設定する (Dynamic IP-2)
  3. Center を固定 IP で設定する。 (Static IP)

pppoe サーバになる機械の情報

Cisco 1921 (giga 2port) に 4port スイッチカードを追加したもの。

Router#show version
Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.1(4)M9, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Fri 12-Sep-14 10:32 by prod_rel_team
....
Cisco CISCO1921/K9 (revision 1.0) with 487424K/36864K bytes of memory.
Processor board ID FGL184220QJ
6 Gigabit Ethernet interfaces
1 terminal line
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity disabled.
255K bytes of non-volatile configuration memory.
245744K bytes of USB Flash usbflash0 (Read/Write)
....
Router#show inventory
NAME: "CISCO1921/K9 chassis", DESCR: "CISCO1921/K9 chassis"
PID: CISCO1921/K9      , VID: V05 , SN: FGL........

NAME: "4 Port GE Non-POE EHWIC Switch on Slot 0 SubSlot 0", DESCR: "4 Port GE Non-POE EHWIC Switch"
PID: EHWIC-4ESG        , VID: V01 , SN: FOC........

先ずは site 側の 172.31.254.x を配布する部分を作成する。(Dynamic IP-1)

基本的な設定を入れる

基本設定
hostname PPPoE-Server
spanning-tree portfast bpduguard

clock timezone JST 9 0
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
ip routing
no ip domain lookup

ssh でのログインの設定

ssh 設定
username admin algorithm-type sha256 secret Cisco1
enable algorithm-type sha256 secret Cisco2

ip domain name my.home

crypto key generate rsa modulus 4096
ip ssh version 2

ip access-list extended MGT_SSH
 permit tcp 10.0.0.0 0.255.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 permit tcp 172.16.0.0 0.15.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 permit tcp 192.168.0.0 0.0.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 permit tcp 100.64.0.0 0.63.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 deny   ip any host 0.0.0.0 log MGT_SSH

line vty 0 15
 access-class MGT_SSH in
 transport input ssh
 login local

username admin ～ ssh 接続の時のパスワード
enable ～ enable パスワード

ip domain name my.home ssh 用の証明書を作成するためにドメインを設定
crypto key generate rsa modulus 4096 rsa の証明書を作成
ip ssh version 2 ssh ver 1 は使わない

ip access-list extended MGT_SSH ssh の接続元をプライベートアドレス、CGN (キャリアグレードナット) からに制限する。
host 0.0.0.0 は、ルータ自身のアドレスのこと。(実際のルータアドレスを指定すると通信できない→特定のアドレスだけ ssh で待ち受けることは不可)

line vty 0 15 telnet/ssh のリモートアクセスを 0～15 (16セッション) 許可する
access-class MGT_SSH リモートアクセスに access-list の MGT_SSH を適用、

transport input ssh ssh の接続を受け付ける
transport input telnet ssh とすれば、telnet & ssh の両方を受け付ける
login local 接続時のアカウントはルータ上のアカウントを利用 (username admin ～)

ssh での接続パスワードを Cisco1 とし、enable パスワードを Cisco2 に設定。
暗号化方式が古いため ssh -o KexAlgorithms=+diffie-hellman-group14-sha1 -c aes256-cbc admin@A.B.C.D で接続。

ntp 設定

ログ設定をしたのでタイムスタンプが気になるので ntp を設定。影響が出ないように vrf を切る。
ssh もこの vrf から接続できるように設定。(接続元はプライベートアドレスと CGN)

ntp 設定
vrf definition MGT
 description Managemane_LAN
 rd 1:100
 address-family ipv4

interface GigabitEthernet0/0
 vrf forwarding MGT
 ip address dhcp
 no shutdown

ntp server vrf MGT 210.173.160.87 minpoll 4

line vty 0 15
 access-class MGT_SSH in vrf-also

in vrf-also vrf を制限せずに telnet/ssh を受け付ける (なければデフォルトの vrf のみ接続可能)

ユーザーとパスワードの登録

userの登録
username site-A@Cisco password pass-A
username site-B@Cisco password pass-B
username site-C@Cisco password pass-C
username site-D@Cisco password pass-D
username site-E@Cisco password pass-E

secret だと認証が通りません。

pppoe クライアントのアドレスプールを定義

pppoe の IP プール
ip local pool PPPOE_POOL 172.31.254.1 172.31.254.254

pppoe サーバのアドレスを定義

  1. Loopback1 interface にアドレスを設定
トンネルの pppoe サーバ側のアドレス
interface Loopback1
 ip address 172.31.0.0 255.255.255.255

サーバー側のトンネルの定義

  1. mtu を設定
  2. ループバックインターフェイスを利用
  3. クライアントのアドレスは PPPOE_POOL から
  4. ppp 認証は chap
  5. DNS を渡す
interface Virtual-Template1
 mtu 1454
 ip unnumbered Loopback1
 peer default ip address pool PPPOE_POOL
 ppp authentication chap
 ppp ipcp dns 1.1.1.1 1.0.0.1

bba グループを定義

bba-group pppoe PPPOE_GROUP
 virtual-template 1
 sessions auto cleanup

vlan1 で pppoe を待ち受け

interface Vlan1
 no ip address
 pppoe enable group PPPOE_GROUP
pppoe サーバの config 全体 
PPPoE-Server#sho running-config
Building configuration...

Current configuration : 3017 bytes
!
! Last configuration change at 21:10:09 JST Tue Jan 2 2024
! NVRAM config last updated at 20:52:11 JST Tue Jan 2 2024
! NVRAM config last updated at 20:52:11 JST Tue Jan 2 2024
version 15.1
service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime show-timezone
no service password-encryption
!
hostname PPPoE-Server
!
boot-start-marker
boot-end-marker
!
!
vrf definition MGT
 description Management_LAN
 rd 1:100
 !
 address-family ipv4
 exit-address-family
!
enable algorithm-type sha256 secret Cisco2
!
no aaa new-model
!
clock timezone JST 9 0
!
no ipv6 cef
ip source-route
ip cef
!
!
!
!
!
no ip domain lookup
ip domain name my.home
!
multilink bundle-name authenticated
!
crypto pki token default removal timeout 0
!
!
license udi pid CISCO1921/K9 sn FGL184220QJ
!
!
!
spanning-tree portfast bpduguard
username admin algorithm-type sha256 secret Cisco1
username site-A@Cisco password 0 pass-A
username site-B@Cisco password 0 pass-B
username site-C@Cisco password 0 pass-C
username site-D@Cisco password 0 pass-D
username site-E@Cisco password 0 pass-E
!
redundancy
!
!
!
!
ip ssh version 2
!
!
!
!
!
!
bba-group pppoe PPPOE_GROUP
 virtual-template 1
 sessions auto cleanup
!
!
interface Loopback1
 ip address 172.31.0.0 255.255.255.255
!
interface Loopback10
 ip address 100.64.10.10 255.255.255.255
!
interface Embedded-Service-Engine0/0
 no ip address
 shutdown
!
interface GigabitEthernet0/0
 vrf forwarding MGT
 ip address dhcp
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/0
 no ip address
!
interface GigabitEthernet0/0/1
 no ip address
!
interface GigabitEthernet0/0/2
 no ip address
!
interface GigabitEthernet0/0/3
 no ip address
!
interface Virtual-Template1
 mtu 1454
 ip unnumbered Loopback1
 peer default ip address pool PPPOE_POOL
 ppp authentication chap
 ppp ipcp dns 1.1.1.1 1.0.0.1
 ppp ipcp mask 255.255.255.240
 ppp ipcp username unique
!
interface Vlan1
 no ip address
 pppoe enable group PPPOE_GROUP
!
ip local pool PPPOE_POOL 172.31.254.1 172.31.254.254
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
!
ip access-list extended MGT_SSH
 permit tcp 10.0.0.0 0.255.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 permit tcp 172.16.0.0 0.15.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 permit tcp 192.168.0.0 0.0.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 permit tcp 100.64.0.0 0.63.255.255 host 0.0.0.0 eq 22 log MGT_SSH
 deny   ip any host 0.0.0.0 log MGT_SSH
!
!
!
!
!
!
!
control-plane
!
!
!
line con 0
line aux 0
line 2
 no activation-character
 no exec
 transport preferred none
 transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
 stopbits 1
line vty 0 4
 access-class MGT_SSH in vrf-also
 login local
 transport input ssh
line vty 5 15
 no login
 transport input none
!
scheduler allocate 20000 1000
ntp server vrf MGT 210.173.160.87 minpoll 4
end

PPPoE-Server#

クライアント側の設定

機器の情報

機器の情報
Router(config)# show version
NEC Portable Internetwork Core Operating System Software
IX Series IX2215 (magellan-sec) Software, Version 10.8.21, RELEASE SOFTWARE
Compiled Jun 20-Tue-2023 12:11:58 JST #2 by sw-build, coregen-10.8(21)

ROM: System Bootstrap, Version 23.1
System Diagnostic, Version 23.1
Initialization Program, Version 10.2

System uptime is 0 minute
System woke up by reload, caused by command execution
System started at Jan 02-Tue-2024 18:21:47 JST
System image file is "ix2215-ms-10.8.21.ldc"

Processor board ID <0>
IX2215 (P1010E) processor with 262144K bytes of memory.
3 GigaEthernet/IEEE 802.3 interfaces
1 ISDN Basic Rate interface
1 USB interface
1024K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)

設定

基本的な設定
hostname site-A
timezone +09 00

logging buffered
logging subsystem all warn
logging timestamp datetime

ntp server 172.31.0.0

ntp サーバーは pppoe サーバへ問い合わせるように

pppoe 設定

pppoe設定
ip route default GigaEthernet0.1

ppp profile ppp_prof_01
  authentication myname site-A@Cisco
  authentication password site-A@Cisco pass-A

interface GigaEthernet0.1
  encapsulation pppoe
  auto-connect
  ppp binding ppp_prof_01
  ip address ipcp
  ip mtu 1454
  ip tcp adjust-mss auto
  ip napt enable
  no shutdown

クライアント用の DHCP 設定

DHCP
ip dhcp enable

ip dhcp profile NET_192_168_1
  assignable-range 192.168.1.100 192.168.1.110
  default-gateway 192.168.1.254
  dns-server 1.0.0.1

interface GigaEthernet2.0
  ip address 192.168.1.254/24
  ip dhcp binding NET_192_168_1
  no shutdown

情報

pppoe サーバ側のステータス表示

show ip interface brief
PPPoE-Server#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
Embedded-Service-Engine0/0 unassigned      YES unset  administratively down down
GigabitEthernet0/0         192.168.0.105   YES DHCP   up                    up
GigabitEthernet0/1         unassigned      YES unset  administratively down down
GigabitEthernet0/0/0       unassigned      YES unset  up                    up
GigabitEthernet0/0/1       unassigned      YES unset  up                    up
GigabitEthernet0/0/2       unassigned      YES unset  down                  down
GigabitEthernet0/0/3       unassigned      YES unset  down                  down
Loopback1                  172.31.0.0      YES manual up                    up
Virtual-Access1            unassigned      YES unset  down                  down
Virtual-Access2            unassigned      YES unset  up                    up
Virtual-Access2.1          172.31.0.0      YES unset  up                    up
Virtual-Template1          172.31.0.0      YES unset  down                  down
Vlan1                      unassigned      YES unset  up                    up

Virtual-Access2.1 が接続しているのが分かります。

show ppp all
PPPoE-Server#show ppp all
Interface/ID OPEN+ Nego* Fail-     Stage    Peer Address    Peer Name
------------ --------------------- -------- --------------- --------------------
Vi2.1        LCP+ CHAP+ IPCP+      LocalT   172.31.254.2    site-A@Cisco

interface以外に、クライアントの IP アドレス、ユーザ名が分かります。

show pppoe summary
PPPoE-Server#show pppoe summary
    PTA  : Locally terminated sessions
    FWDED: Forwarded sessions
    TRANS: All other sessions (in transient state)

                                TOTAL     PTA   FWDED   TRANS
TOTAL                               1       1       0       0
Vlan1                               1       1       0       0
PPPoE-Server#

接続数が見えます。

show pppoe session
PPPoE-Server#show pppoe session
     1 session  in LOCALLY_TERMINATED (PTA) State
     1 session  total

Uniq ID  PPPoE  RemMAC          Port                    VT  VA         State
           SID  LocMAC                                      VA-st      Type
    131    131  0060.b9aa.e586  Vl1                      1  Vi2.1      PTA
                fc5b.39c0.f820                              UP

Mac addr、interface が分かります。

show interfaces
PPPoE-Server#show interfaces Virtual-Access2.1
Virtual-Access2.1 is up, line protocol is up
  Hardware is Virtual Access interface
  Interface is unnumbered. Using address of Loopback1 (172.31.0.0)
  MTU 1454 bytes, BW 100000 Kbit/sec, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Open
  Open: IPCP
  PPPoE vaccess, cloned from Virtual-Template1
  Vaccess status 0x0
  Keepalive set (10 sec)
     1568 packets input, 141935 bytes
     899 packets output, 41932 bytes
  Last clearing of "show interface" counters never

pppoe クライアント側のステータス表示

site-A(config)# show ip address
Interface GigaEthernet0.1 is up, line protocol is up
  Internet address is 172.31.254.2/32
  Broadcast address is 255.255.255.255
  Peer address is 172.31.0.0
  Address determined by IPCP
  Primary DNS server is 1.0.0.1
  Secondary DNS server is 8.8.4.4
Interface GigaEthernet2.0 is up, line protocol is up
  Internet address is 192.168.1.254/24
  Broadcast address is 255.255.255.255
  Address determined by config
Interface Null0.0 is up, line protocol is up
  Interface is unnumbered.
site-A(config)#
show ip route
site-A(config)# show ip route
IP Routing Table - 3 entries, 1 hidden, 2044 frees
Entries: 2 Connected, 1 Static, 0 RIP, 0 OSPF, 0 BGP
Codes: C - Connected, S - Static, R - RIP, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, B - BGP
       * - Candidate default, s - Summary
Timers: Age
S*   0.0.0.0/0 [1/1] is directly connected, GigaEthernet0.1, 0:41:33
     172.31.0.0/16 is subnetted, 1 subnets
C      172.31.0.0/32 [0/0] is directly connected, GigaEthernet0.1, 0:41:33
C    192.168.1.0/24 [0/0] is directly connected, GigaEthernet2.0, 0:41:02
同じアカウントで2セッション繋いでみました
PPPoE-Server#show ppp all
Interface/ID OPEN+ Nego* Fail-     Stage    Peer Address    Peer Name
------------ --------------------- -------- --------------- --------------------
Vi2.3        LCP+ CHAP+ IPCP+      LocalT   172.31.254.4    site-B@Cisco
Vi2.2        LCP+ CHAP+ IPCP+      LocalT   172.31.254.3    site-B@Cisco
Vi2.1        LCP+ CHAP+ IPCP+      LocalT   172.31.254.2    site-A@Cisco

制限を掛けていないので、2セッション繋がりますね。

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