please show your config

most probably, you configured padi limit on interface

ppp]
verbose=1
min-mtu=1280
mtu=1492
mru=1492
#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=20
#lcp-echo-failure=3
lcp-echo-timeout=120
unit-cache=1
unit-preallocate=1

if no, then it is a built-in limit (1 padi/sec per mac)

pppoe]
verbose=1
ac-name=pppoe6
#service-name=yyy
#pado-delay=0
#pado-delay=0,100:100,200:200,-1:500
called-sid=ifname
#tr101=1
#padi-limit=0
ip-pool=realip
#ipv6-pool=pppoe
#ipv6-pool-delegate=pppoe
#ifname=pppoe%d
sid-uppercase=1
#vlan-mon=eth0,10-200
#vlan-timeout=60
#vlan-name=%I.%N
#interface=eth1,padi-limit=1000
interface=re:eth2\.\d+,padi-limit=1000000

show interface=…

if no, then it is a built-in limit (1 padi/sec per sec)

https://accel-ppp.org/accel-ppp.conf.html#:~:text=Rate%20of%20per%2Dmac%20PADI,than%201%20packet%20per%20second.&text=If%20this%20option%20is%20given%20ppp%20interface%20will%20be%20renamed,pppoe%25d%20%3D%3E%20pppoe0.

padi-limit=n
Specifies overall limit of PADI packets to reply in 1 second period (default 0 - unlimited). Rate of per-mac PADI packets is limited to no more than 1 packet per second.

rtfm

yes

what to do ?

nothing

you do not need to do anything

it’s not an issue

this is not flood?

check it using tcpdump

on interface whre is it vlan on pppoe?

eth2.150

8:0d:67:a5:20:c2 > 6c:b3:11:3c:a4:22, PPPoE S, length 74: PPPoE  [ses 0xe400] IP (0x0021), length 54: 10.10.42.182.54622 > 185.102.217.47.443: tcp 0
98:0d:67:a5:20:c2 > 6c:b3:11:3c:a4:22, PPPoE S, length 74: PPPoE  [ses 0xe400] IP (0x0021), length 54: 10.10.42.182.54622 > 185.102.217.47.443: tcp 0
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
c0:4a:00:fc:f3:db > 6c:b3:11:3c:a4:22, PPPoE S, length 62: PPPoE  [ses 0x3ac1] IP (0x0021), length 42: 10.10.44.218.49818 > 5.9.115.196.443: tcp 0
6c:b3:11:3c:a4:22 > d4:6e:0e:74:86:77, PPPoE S, length 1302: PPPoE  [ses 0x9500] IP (0x0021), length 1282: 85.187.50.33.443 > 10.10.42.26.57949: UDP, length 1252
6c:b3:11:3c:a4:22 > d4:6e:0e:74:86:77, PPPoE S, length 1302: PPPoE  [ses 0x9500] IP (0x0021), length 1282: 85.187.50.33.443 > 10.10.42.26.57949: UDP, length 1252
6c:b3:11:3c:a4:22 > d4:6e:0e:74:86:77, PPPoE S, length 1302: PPPoE  [ses 0x9500] IP (0x0021), length 1282: 85.187.50.33.443 > 10.10.42.26.57949: UDP, length 1252
6c:b3:11:3c:a4:22 > d4:6e:0e:74:86:77, PPPoE S, length 1302: PPPoE  [ses 0x9500] IP (0x0021), length 1282: 85.187.50.33.443 > 10.10.42.26.57949: UDP, length 1252
6c:b3:11:3c:a4:22 > d4:6e:0e:74:86:77, PPPoE S, length 1302: PPPoE  [ses 0x9500] IP (0x0021), length 1282: 85.187.50.33.443 > 10.10.42.26.57949: UDP, length 1252
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
98:0d:67:a5:20:c2 > 6c:b3:11:3c:a4:22, PPPoE S, length 74: PPPoE  [ses 0xe400] IP (0x0021), length 54: 10.10.42.182.54622 > 185.102.217.47.443: tcp 0
6c:b3:11:3c:a4:22 > 98:0d:67:a5:20:c2, PPPoE S, length 1514: PPPoE  [ses 0xe400] IP (0x0021), length 1494: 185.102.217.47.443 > 10.10.42.182.54622: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
98:0d:67:a5:20:c2 > 6c:b3:11:3c:a4:22, PPPoE S, length 74: PPPoE  [ses 0xe400] IP (0x0021), length 54: 10.10.42.182.54622 > 185.102.217.47.443: tcp 0
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1502: PPPoE  [ses 0x3ac1] IP (0x0021), length 1482: 5.9.115.196.443 > 10.10.44.218.49818: tcp 1440
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE S, length 1400: PPPoE  [ses 0x3ac1] IP (0x0021), length 1380: 85.187.222.13.443 > 10.10.44.218.62121: UDP, length 1350
6c:b3:11:3c:a4:22 > c0:4a:00:fc:f3:db, PPPoE