いままでモデム + 電話回線や PHS で PPP 接続を行っていた機器の構成の モデム + 電話回線 の部分を MA-S1xx/MA-E3xx¹⁾ で置き換えることができます。

MA-S1xx/MA-E3xx 側の設定は下記 WebUI の画面で行います。

※ 本装置側の PPP I/F は “ppp100” になります。インターネットなどに抜ける際は、適切なルーティング設定が必要です。

本装置とは、RS-232C インターリンクケーブル²⁾(例 サンワサプライ RS-232Cケーブル(インタリンク・クロス・2m)) で接続します。
Linux で PPP 接続をする場合は、下記のような設定になります。

ppp0

unit 0
hide-password
noauth
connect "/usr/sbin/chat -v -f /etc/chatscripts/ppp0"
debug
modem
lock
/dev/ttyUSB0
115200
noipdefault
defaultroute
replacedefaultroute
maxfail 40
remotename ppp0
ipparam ppp0
 
nopersist
usepeerdns

ppp0

TIMEOUT 10
'' ATZ
OK ATE0
ABORT BUSY
ABORT 'NO CARRIER'
ABORT VOICE
ABORT 'NO DIALTONE'
ABORT 'NO DIAL TONE'
ABORT 'NO ANSWER'
ABORT DELAYED
ABORT ERROR
TIMEOUT 30
 
OK ATDT5555
CONNECT \d\c

※ ATDT5555 の電話番号指定は、WebUI の 『着信 電話番号』で設定した番号にします。

PPP 接続を実行した場合のログの例です。

Aug 17 11:38:03 lg-gram pppd[4125]: pppd 2.4.7 started by root, uid 0
Aug 17 11:38:04 lg-gram chat[4127]: timeout set to 10 seconds
Aug 17 11:38:04 lg-gram chat[4127]: send (ATZ^M)
Aug 17 11:38:04 lg-gram chat[4127]: expect (OK)
Aug 17 11:38:04 lg-gram chat[4127]: ATZ^M^M
Aug 17 11:38:04 lg-gram chat[4127]: OK
Aug 17 11:38:04 lg-gram chat[4127]:  -- got it
Aug 17 11:38:04 lg-gram chat[4127]: send (ATE0^M)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (BUSY)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (NO CARRIER)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (VOICE)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (NO DIALTONE)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (NO DIAL TONE)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (NO ANSWER)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (DELAYED)
Aug 17 11:38:04 lg-gram chat[4127]: abort on (ERROR)
Aug 17 11:38:04 lg-gram chat[4127]: timeout set to 30 seconds
Aug 17 11:38:04 lg-gram chat[4127]: expect (OK)
Aug 17 11:38:04 lg-gram chat[4127]: ^M
Aug 17 11:38:04 lg-gram chat[4127]: ATE0^M^M
Aug 17 11:38:04 lg-gram chat[4127]: OK
Aug 17 11:38:04 lg-gram chat[4127]:  -- got it
Aug 17 11:38:04 lg-gram chat[4127]: send (ATDT5555^M)
Aug 17 11:38:04 lg-gram chat[4127]: expect (CONNECT)
Aug 17 11:38:04 lg-gram chat[4127]: ^M
Aug 17 11:38:04 lg-gram chat[4127]: ^M
Aug 17 11:38:04 lg-gram chat[4127]: CONNECT
Aug 17 11:38:04 lg-gram chat[4127]:  -- got it
Aug 17 11:38:04 lg-gram chat[4127]: send (\d)
Aug 17 11:38:05 lg-gram pppd[4125]: Script /usr/sbin/chat -v -f /etc/chatscripts/ppp0 finished (pid 4126), status = 0x0
Aug 17 11:38:05 lg-gram pppd[4125]: Serial connection established.
Aug 17 11:38:05 lg-gram pppd[4125]: using channel 3
Aug 17 11:38:05 lg-gram pppd[4125]: Using interface ppp0
Aug 17 11:38:05 lg-gram pppd[4125]: Connect: ppp0 <--> /dev/ttyUSB0
Aug 17 11:38:05 lg-gram NetworkManager[952]: <info>  [1629167885.7692] manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/6)
Aug 17 11:38:05 lg-gram systemd-udevd[4128]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.
Aug 17 11:38:06 lg-gram pppd[4125]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xb452adfb> <pcomp> <accomp>]
Aug 17 11:38:07 lg-gram pppd[4125]: rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xade986dc> <pcomp> <accomp>]
Aug 17 11:38:07 lg-gram pppd[4125]: sent [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xade986dc> <pcomp> <accomp>]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xb452adfb> <pcomp> <accomp>]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xb452adfb> <pcomp> <accomp>]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [LCP EchoReq id=0x0 magic=0xb452adfb]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [LCP EchoReq id=0x0 magic=0xade986dc]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [LCP EchoRep id=0x0 magic=0xb452adfb]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 192.168.1.1>]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [IPCP ConfAck id=0x1 <compress VJ 0f 01> <addr 192.168.1.1>]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [LCP EchoRep id=0x0 magic=0xade986dc]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [CCP ConfAck id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
Aug 17 11:38:09 lg-gram pppd[4125]: Deflate (15) compression enabled
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [IPCP ConfNak id=0x1 <addr 192.168.1.254> <ms-dns1 192.168.1.1> <ms-dns2 192.168.1.1>]
Aug 17 11:38:09 lg-gram pppd[4125]: sent [IPCP ConfReq id=0x2 <compress VJ 0f 01> <addr 192.168.1.254> <ms-dns1 192.168.1.1> <ms-dns2 192.168.1.1>]
Aug 17 11:38:09 lg-gram pppd[4125]: rcvd [IPCP ConfAck id=0x2 <compress VJ 0f 01> <addr 192.168.1.254> <ms-dns1 192.168.1.1> <ms-dns2 192.168.1.1>]
Aug 17 11:38:09 lg-gram pppd[4125]: replacing old default route to wlp1s0 [172.16.1.66]
Aug 17 11:38:09 lg-gram pppd[4125]: local  IP address 192.168.1.254 <-------------------- 割り当てられた IP アドレス
Aug 17 11:38:09 lg-gram pppd[4125]: remote IP address 192.168.1.1
Aug 17 11:38:09 lg-gram pppd[4125]: primary   DNS address 192.168.1.1 <--- DNS server
Aug 17 11:38:09 lg-gram pppd[4125]: secondary DNS address 192.168.1.1
Aug 17 11:38:09 lg-gram pppd[4125]: Script /etc/ppp/ip-up started (pid 4135)
Aug 17 11:38:09 lg-gram NetworkManager[952]: <info>  [1629167889.8956] device (ppp0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external')
Aug 17 11:38:09 lg-gram NetworkManager[952]: <info>  [1629167889.9021] device (ppp0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external')
Aug 17 11:38:09 lg-gram dnsmasq[1123]: reading /run/dnsmasq/resolv.conf
Aug 17 11:38:09 lg-gram dnsmasq[1123]: using nameserver 192.168.1.1#53
Aug 17 11:38:09 lg-gram pppd[4125]: Script /etc/ppp/ip-up finished (pid 4135), status = 0x0

IP アドレスとして 192.168.1.254 が割り当てられ、本装置の IP アドレスが DNS サーバーとして設定されていることが確認できます。