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Old 8th November 2016
shep shep is offline
Real Name: Scott
Arp Constable
 
Join Date: May 2008
Location: Dry and Dusty
Posts: 1,503
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Tech support at my ISP was clueless about MTU settings - a supervisor did say to set the modem's MTU to 1492 bytes. Hopefully, it was not just to make me go away.

What I'm wondering is is if I generate a data packets of 1500 octets on my system, say in an email with attachments, I would expect it to fragment when passed over the segment between the Netis modem and the ISP. My re(4) ifconfig settings show an MTU of 1500:
Code:
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:e0:4d:74:59:44
        index 1 priority 0 llprio 3
        groups: egress
        media: Ethernet autoselect (100baseTX full-duplex,rxpause,txpause)
        status: active
        inet 192.168.1.3 netmask 0xffffff00 broadcast 192.168.1.255
.

Would it be advised to set the MTU on the LAN clients and router to 1492 bytes?

Last edited by shep; 8th November 2016 at 07:23 PM. Reason: clarity
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