хотя второй же есть

сейчас попробую

еще вот такое сыплет на первом сервере

info: eth1.146: recv [PPPoE PADT 50:0f:f5:58:4a:50 => 00:e0:ed:55:03:81 sid=0000 <Generic-Error>]

на втором жду пока когото дропнет

info: ppp0: send [RADIUS(1) Accounting-Request id=6 <User-Name "ojs"> <NAS-Identifier "accel35"> <NAS-IP-Address 172.16.10.23> <NAS-Port 0> <NAS-Port-Id "ppp0"> <NAS-Port-Type Virtual> <Service-Type Framed-User> <Framed-Protocol PPP> <Calling-Station-Id "c0:4a:00:48:57:b5"> <Called-Station-Id "eth3.212"> <Acct-Status-Type Stop> <Acct-Authentic RADIUS> <Acct-Session-Id "242c6fb85c75d1b3"> <Acct-Session-Time 125> <Acct-Input-Octets 5303> <Acct-Output-Octets 4028> <Acct-Input-Packets 69> <Acct-Output-Packets 48> <Acct-Input-Gigawords 0> <Acct-Output-Gigawords 0> <Acct-Delay-Time 0> <Framed-IP-Address 10.0.10.43> <Acct-Terminate-Cause Lost-Carrier>]

а перед этим [2021-04-03 16:45:45]:  warn: ppp0: lcp: no echo reply
[2021-04-03 16:45:45]: debug: ppp0: terminate
[2021-04-03 16:45:45]: debug: libnetlink: RTNETLINK answers: No such device
[2021-04-03 16:45:45]:  warn: ppp0: failed to get interface statistics
[2021-04-03 16:45:45]: debug: libnetlink: RTNETLINK answers: No such device
[2021-04-03 16:45:45]:  warn: ppp0: failed to get interface statistics

вот снова полный лог

debug: ppp1: send [LCP EchoReq id=30 <magic 5a6dddfd>]
[2021-04-03 16:54:07]:  warn: ppp1: lcp: no echo reply
[2021-04-03 16:54:07]: debug: ppp1: terminate
[2021-04-03 16:54:07]: debug: libnetlink: RTNETLINK answers: No such device
[2021-04-03 16:54:07]:  warn: ppp1: failed to get interface statistics
[2021-04-03 16:54:07]: debug: libnetlink: RTNETLINK answers: No such device
[2021-04-03 16:54:07]:  warn: ppp1: failed to get interface statistics
[2021-04-03 16:54:07]:  info: ppp1: send [RADIUS(1) Accounting-Request id=13 <User-Name "gigi"> <NAS-Identifier "accel35"> <NAS-IP-Address 172.16.10.23> <NAS-Port 1> <NAS-Port-Id "ppp1"> <NAS-Port-Type Virtual> <Service-Type Framed-User> <Framed-Protocol PPP> <Calling-Station-Id "d4:6e:0e:50:77:2f"> <Called-Station-Id "eth2.112"> <Acct-Status-Type Stop> <Acct-Authentic RADIUS> <Acct-Session-Id "242c6fb85c75d1b4"> <Acct-Session-Time 539> <Acct-Input-Octets 4106123> <Acct-Output-Octets 166341659> <Acct-Input-Packets 40528> <Acct-Output-Packets 124973> <Acct-Input-Gigawords 0> <Acct-Output-Gigawords 0> <Acct-Delay-Time 0> <Framed-IP-Address 10.0.12.15> <Acct-Terminate-Cause Lost-Carrier>]
[2021-04-03 16:54:07]: debug: ppp1: pppoe: ppp finished
[2021-04-03 16:54:07]: debug: ppp1: lcp_layer_free
[2021-04-03 16:54:07]:  info: recv [RADIUS(1) Accounting-Response id=13]
[2021-04-03 16:54:07]: debug: ppp1: auth_layer_free
[2021-04-03 16:54:07]: debug: ppp1: ccp_layer_free
[2021-04-03 16:54:07]: debug: ppp1: ipcp_layer_free
[2021-04-03 16:54:07]: debug: ppp1: ipv6cp_layer_free
[2021-04-03 16:54:07]: debug: ppp1: ppp destablished
[2021-04-03 16:54:07]:  info: eth2.112: send [PPPoE PADT 00:1b:21:48:3c:0c => d4:6e:0e:50:77:2f sid=0040 <AC-Name accel-ppp> <Service-Name >]
[2021-04-03 16:54:07]:  info: ppp1: disconnected
[2021-04-03 16:54:35]:  info: eth2.107: recv [PPPoE PADI d8:50:e6:51🇦🇩82 => ff:ff:ff:ff:ff:ff sid=0000 <Service-Name > <Host-Uniq 010000000000000001000000>]
[2021-04-03 16:54:35]:  info: eth2.107: send [PPPoE PADO 00:1b:21:48:3c:0c => d8:50:e6:51🇦🇩82 sid=0000 <AC-Name accel-ppp> <Service-Name > <AC-Cookie c41357bdc1ab19bd80851697d61e12924588a99a331993be> <Host-Uniq 010000000000000001000000>]

Lost carier, потеря клиента по lcp

Что в секции ppp?

[ppp]
verbose=1
min-mtu=1280
mtu=1480
mru=1480
#accomp=deny
#pcomp=deny
#ccp=0
#mppe=require
ipv4=require
ipv6=deny
ipv6-intf-id=0:0:0:1
ipv6-peer-intf-id=0:0:0:2
ipv6-accept-peer-intf-id=1
lcp-echo-interval=5
lcp-echo-failure=3
#lcp-echo-timeout=120
unit-cache=1
#unit-preallocate=1

в этом же влане клиенты сутками висят

а когото рвет постоянно

С физикой все отлично там?

А зачем вам интервал 5 секунд?

два разных сервера разные сетевушки

разная физика

общее только одно

бегут через один цисарь