[メモ]AT-AR2050VとNCXX UX302NCでpovo2.0に繋ぐ[モバイル回線バックアップ]

概要

Allied-Telesis AT-AR2050Vはホームページの特徴欄に記載はないものの仕様書には移動体データ通信への対応が記載されている。

NCXX UX302NCはSIMフリーでdocomo/auのプラチナバンドに対応しているLTE対応USBデータ通信端末だが、microSIMだからか適当な値段で売られている。(対応バンドは1, 3, 18, 19, 21)

UX302NC自身は他社ルーター(NEC/Fujitsu/古河電工など)でもサポートがあるそこそこの端末なためダメ元で差して設定してみたところ動作した。

設定

最小限の設定例

conf t
interface cellular0
 encapsulation ppp 0
 apn povo.jp
!
interface ppp0
 ppp ipcp dns request
 keepalive
 ip address negotiated
 ip tcp adjust-mss pmtu
 ppp authentication chap
!

interface名はTab補完が効かないので気にせず入力すること

設定が入り通信できる状態になると以下のようになる

awplus#show interface cellular0
Interface cellular0
  Link is DOWN, administrative state is UP
  Hardware is Unknown
  index 33556224 inactive interface
  PPP Encapsulation is enabled, interface ppp0
awplus#show interface ppp0
Interface ppp0
  Link is UP, administrative state is UP
  Hardware is PPP
  IPv4 address 10.xxx.xxx.xxx/32 point-to-point 10.64.64.64
  index 30000 metric 1 mtu 1500
  <UP,POINT-TO-POINT,RUNNING,NOARP,MULTICAST>
  VRF Binding: Not bound
  PPP is running over interface cellular0
  LCP Opened IPCP Opened 
  MRU(bytes): Local config 1500, Local negotiated 1500, Peer negotiated 0
  Magic number: Local config ON, Local negotiated ON, Peer negotiated ON
  Authentication: Local config None, Local neg None, Peer neg PAP
  IPv4 addresses: Local config 0.0.0.0
                  Local neg 10.xxx.xxx.xxx, Peer neg 0.0.0.0
  Local DNS addresses: 111.87.221.139, 111.87.221.129
  IPv6 Id Local config: 0000:0000:0000:0000
  SNMP link-status traps: Disabled
  Router Advertisement is disabled
  Router Advertisement default routes are accepted
  Router Advertisement prefix info is accepted
    input packets 102, bytes 8633, dropped 0, multicast packets 0
    output packets 108, bytes 6538, multicast packets 0, broadcast packets 0
    input average rate : 30 seconds 12 bps, 5 minutes 37 bps
    output average rate: 30 seconds 12 bps, 5 minutes 27 bps
    input peak rate 9.55 Kbps at 2025/02/19 17:14:38
    output peak rate 6.46 Kbps at 2025/02/19 17:14:38
  Time since last state change: 0 days 00:13:35
awplus#show ip route 
Codes: C - connected, S - static, R - RIP, B - BGP
       O - OSPF, D - DHCP, 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
       i - IS-IS, L1 - IS-IS level 1, L2 - IS-IS level 2, ia - IS-IS inter area
       * - candidate default

Gateway of last resort is 10.64.64.64 to network 0.0.0.0

S*      0.0.0.0/0 [100/0] via 10.64.64.64, ppp0 weight 1
C       10.xxx.xxx.xxx/32 is directly connected, ppp0
C       10.64.64.64/32 is directly connected, ppp0
C       172.XX.X.0/24 is directly connected, vlan1
C       192.168.X.0/24 is directly connected, eth1