ISC-DHCP 서버는 동일한 인터페이스에 두 개의 IP 주소를 할당합니까?

두 개의 이더넷 장치가 있는 RaspberryPi(VPNbridge라고 함)에 ISC DHCP 서버가 있습니다. 하나는 일반(내부) 이더넷 장치( eth0)이고 다른 하나는 eth1Aastra VoIP 전화에 연결한 USB-이더넷 장치( )입니다. 따라서 RaspberryPi 서버는 Aastra VoIP 전화와 VPN 네트워크 사이의 "브리지" 역할을 합니다.

문제는 Aastra 전화(또는 RaspberryPi의 커넥터에 연결된 다른 장치)가 몇 분마다 연결이 끊어진다는 것입니다. 또한 eth1RaspberryPi의 장치에는 두 개의 IP 주소가 있습니다.

내 구성은 다음과 같습니다.

나는 /etc/dhcp/dhcpd.conf다음을 가지고 있습니다 :

default-lease-time 600;
max-lease-time 7200;

ddns-update-style none;

authoritative;
subnet 192.168.100.0 netmask 255.255.255.0 {
  range 192.168.100.50 192.168.100.51;
  option routers 192.168.100.1;
  option domain-name-servers 8.8.8.8;
  option domain-name "vpnbridge.local";
  ###option subnet-mask 255.255.255.0;
}

host aastraphone {
  hardware ethernet 00:08:5d:35:e8:57;
  fixed-address 192.168.100.51;
}

나는 /etc/default/isc-dhcp-server다음을 가지고 있습니다 :

INTERFACESv4="eth1"
INTERFACESv6=""

sudo systemctl status isc-dhcp-server

● isc-dhcp-server.service - LSB: DHCP server
   Loaded: loaded (/etc/init.d/isc-dhcp-server; generated)
   Active: active (running) since Sat 2022-08-06 23:37:59 CEST; 4min 42s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 597 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=0/SUCCESS)
    Tasks: 1 (limit: 2059)
   CGroup: /system.slice/isc-dhcp-server.service
           └─671 /usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf eth1

avg 06 23:41:44 vpnbridge dhcpd[671]: DHCPDISCOVER from 00:e0:4c:89:c3:e2 via eth1
avg 06 23:41:45 vpnbridge dhcpd[671]: DHCPOFFER on 192.168.100.50 to 00:e0:4c:89:c3:e2 (vpnbridge) via eth1
avg 06 23:41:45 vpnbridge dhcpd[671]: DHCPREQUEST for 192.168.100.50 (192.168.100.1) from 00:e0:4c:89:c3:e2 (vpnbridge) via eth1
avg 06 23:41:45 vpnbridge dhcpd[671]: DHCPACK on 192.168.100.50 to 00:e0:4c:89:c3:e2 (vpnbridge) via eth1
avg 06 23:41:48 vpnbridge dhcpd[671]: DHCPDISCOVER from 00:08:5d:35:e8:57 via eth1
avg 06 23:41:48 vpnbridge dhcpd[671]: DHCPOFFER on 192.168.100.51 to 00:08:5d:35:e8:57 via eth1
avg 06 23:41:50 vpnbridge dhcpd[671]: DHCPDISCOVER from 00:08:5d:35:e8:57 via eth1
avg 06 23:41:50 vpnbridge dhcpd[671]: DHCPOFFER on 192.168.100.51 to 00:08:5d:35:e8:57 via eth1
avg 06 23:41:55 vpnbridge dhcpd[671]: DHCPREQUEST for 192.168.100.51 (192.168.100.1) from 00:08:5d:35:e8:57 via eth1
avg 06 23:41:55 vpnbridge dhcpd[671]: DHCPACK on 192.168.100.51 to 00:08:5d:35:e8:57 via eth1

ip a show eth1RaspberryPi에 표시됨:

5: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:e0:4c:89:c3:e2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.1/24 brd 192.168.100.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet 192.168.100.50/24 brd 192.168.100.255 scope global secondary dynamic noprefixroute eth1
       valid_lft 474sec preferred_lft 399sec
    inet6 fe80::2e0:4cff:fe89:c3e2/64 scope link 
       valid_lft forever preferred_lft forever

또한 RaspberryPi에는 다음이 있습니다 cat /etc/network/interfaces.d/eth1.

auto eth1
iface eth1 inet static
address 192.168.100.1
netmask 255.255.255.0

내가 뭘 잘못했나요?