Gigabit 네트워크 질문입니다

Gigabit 을 사용하고 있는데요
핑이 자꾸 빠지는 현상이 일어납니다.

root@:~# ethtool eth1
Settings for eth1:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: MII
PHYAD: 1
Transceiver: external
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x0000003f (63)
drv probe link timer ifdown ifup
Link detected: yes
root@:~#

보드에서 ethtool을 확인한 건데 gigabit으로 잡히긴 했는데 좀 의문사항이
현재 RGMII를 사용하는데 MII라고 표시가 됩니다... 이게 RGMII를 인식을 못하는 것인지
제가 세팅을 잘못한 것인지 아리까리하네요,,

제가 속도테스트라고 해야하나요? 그걸 했을때 정상적으로 gigabit 속도가 나왔는데..
어느순간부터 핑이 막 빠지는 현상이 발생하네여

PING 192.168.2.150 (192.168.2.150): 56 data bytes
64 bytes from 192.168.2.150: seq=2 ttl=128 time=0.695 ms
64 bytes from 192.168.2.150: seq=4 ttl=128 time=0.897 ms

64 bytes from 192.168.2.150: seq=7 ttl=128 time=0.656 ms
64 bytes from 192.168.2.150: seq=9 ttl=128 time=0.680 ms
64 bytes from 192.168.2.150: seq=14 ttl=128 time=0.487 ms
64 bytes from 192.168.2.150: seq=22 ttl=128 time=0.680 ms
64 bytes from 192.168.2.150: seq=30 ttl=128 time=0.702 ms
64 bytes from 192.168.2.150: seq=33 ttl=128 time=0.674 ms
64 bytes from 192.168.2.150: seq=34 ttl=128 time=0.633 ms
64 bytes from 192.168.2.150: seq=35 ttl=128 time=0.685 ms
64 bytes from 192.168.2.150: seq=40 ttl=128 time=0.648 ms
64 bytes from 192.168.2.150: seq=43 ttl=128 time=0.692 ms
64 bytes from 192.168.2.150: seq=44 ttl=128 time=0.740 ms
64 bytes from 192.168.2.150: seq=55 ttl=128 time=502.710 ms
64 bytes from 192.168.2.150: seq=56 ttl=128 time=0.721 ms
64 bytes from 192.168.2.150: seq=59 ttl=128 time=0.705 ms
64 bytes from 192.168.2.150: seq=61 ttl=128 time=0.623 ms
64 bytes from 192.168.2.150: seq=62 ttl=128 time=0.658 ms
64 bytes from 192.168.2.150: seq=63 ttl=128 time=0.655 ms
64 bytes from 192.168.2.150: seq=64 ttl=128 time=0.600 ms
64 bytes from 192.168.2.150: seq=65 ttl=128 time=0.713 ms
64 bytes from 192.168.2.150: seq=66 ttl=128 time=0.702 ms
64 bytes from 192.168.2.150: seq=68 ttl=128 time=0.675 ms
64 bytes from 192.168.2.150: seq=69 ttl=128 time=0.676 ms

요런식으로 seq가 중간중간 빠지는 현상이 일어나는데 혹시 gigabit포팅해보신분 게시면

조언좀 부탁드립니다