responsepax.blogg.se - How to set mtu for vpn in mac

I would recommend that you remove the 3 extra nameservers that you added to /etc/resolvconf//head and let systemd-resolved properly manage /etc/nf. Reference: How to determine the proper MTU size with ICMP pings Ping -c 4 -M do -s 1453 8.8.8.8 # still no fragmentation? Ping -c 4 -M do -s 1462 8.8.8.8 # may show fragmentation ping -c 4 -M do -s 1472 8.8.8.8 # this will probably show fragmentation

The actual MTU size would be 1480, which is the optimum for the network we're working with. let's say that 1452 was the proper packet size (where you first got an ICMP reply to your ping). Take that value (last good value) and add 28 to the value to account for the various TCP/IP headers. Once you get a reply, go up by 1 until you get a fragmented packet. You should always start at 1472 and work your way down by 10 each time.

s packet_size: Specifies the number of data bytes to be sent.

may be either do (prohibit fragmentation, even local one), want (do PMTU discovery, fragment locally when packet size is large), or dont (do not set DF flag).

M hint: Select Path MTU Discovery strategy.

Note: first remove your mods to /etc/dhcp/nf and reboot. To determine the correct MTU setting, start with all MTU settings = 1500 and VPN = off. |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig. The dpkg -l *dnsmasq* output is: Desired=Unknown/Install/Remove/Purge/Hold

The resolvectl output is: Current DNS Server: 1.1.1.1

Why? How can I change it to exactly 1200?Ĭat /etc/nf: lrwxrwxrwx 1 root root 29 Mar 19 13:05 /etc/nf ->. I went to this file /etc/dhcp/nf and added these two lines before the request line: default interface-mtu 1200 Īfter I restarted and the system boots up, I run ifconfig and it says my MTU size is 1280.