北京联通1480是什么梗？

ax4Bz

经常看到有人提，这是什么梗？我试了下北京联通确实是1480，这咋了？

1. root@aml:~# ping -s 1453 -M do 114.114.114.114
   
2. PING 114.114.114.114 (114.114.114.114) 1453(1481) bytes of data.
   
3. ping: local error: Message too long, mtu=1480
   
4. ping: local error: Message too long, mtu=1480
   
5. ping: local error: Message too long, mtu=1480
   
6. ^C
   
7. --- 114.114.114.114 ping statistics ---
   
8. 3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2055ms
   
9. 
   
10. root@aml:~# ping -s 1452 -M do 114.114.114.114
    
11. PING 114.114.114.114 (114.114.114.114) 1452(1480) bytes of data.
    
12. 1460 bytes from 114.114.114.114: icmp_seq=1 ttl=56 time=10.4 ms
    
13. 1460 bytes from 114.114.114.114: icmp_seq=2 ttl=56 time=10.4 ms
    
14. 1460 bytes from 114.114.114.114: icmp_seq=3 ttl=56 time=11.8 ms
    
15. 1460 bytes from 114.114.114.114: icmp_seq=4 ttl=56 time=10.3 ms

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