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MTU configure too small cause two PC connect to ONT can't ftp to each other

Publication Date:  2019-07-10 Views:  134 Downloads:  0

Issue Description

on MA5680T I configured L3 VPN service for two ONT, two PC connect to ONT HG810 can ping each other. One PC became a FTP server, other was a FTP client but two PC could not executed FTP session.

Alarm Information

Null

Handling Process

I changed MTU value on ethernet switch port bigger than 1507, for example 1550 KB, after that two PC could run FTP normally.

Root Cause

Run Ethereal software to packet  header obtaining I knew that the FTP session was interrupted due to packet length was exceeded MTU value. the length of packet file after tag 2 VLANs is 1507 KB but MTU value on Ethernet switch port is 1500, by this reason the packet was dropped so two PC could not run FTP servive.

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