I may be looking at this incorrectly, so any feedback is welcomed. MTU MediaSenseState Bytes In Bytes Out Interface - 4294967295 1 0 2848160 Loopback Pseudo-Interf1 1508509583 35863160 Wi-Fi tcpsessionwithoutsyn - Enable/disable creation of TCP session without SYN flag. The maximum segment size (MSS) is the largest amount of data, specified in bytes, that a device can handle in a single non-fragmented piece. I ran the following commands on my AP profile, but when running a pcap at the FortiGate FW and on my workstation, I still see TCP packets with a length of 1514.Ĭonfig wireless-controller wtp-profile edit A-FORTIAP-PROFILE set ip-fragment-preventing tcp-mss-adjust icmp-unreachable set tun-mtu-uplink 1400 set tun-mtu-downlink 1400 next endġ1997đ91.313805 10.10.252.10 52.96.230.2 TCPĖ6Ę595 → 443 Seq=0 Win=64240 Len=0 MSS=1460 WS=256 SACK_PERM=1Ĩ801đ86.409026 52.96.230.2 10.10.252.10 TCPđ514Ĕ43 → 8595 Seq=1560 Ack=1583 Win=4194560 Len=1460 Īnd when checking the MTU of the interface, I notice my MTU is 1500, when my assumption was the the MTU is negotiated to a lower rate during the wireless auth.Ĭ:\>netsh interface ipv4 show subinterfaces I was tried to create simple laboratory with MSS, Fortigate FW and IXIA traffick generator. 1 Comment Posted by cjcott01 on April 21, 2014.
Is there any way to verify if (or how) the " tcp-mss-adjust" command is working? This article explains how to set the MTU value on the default WAN interface whenever the VPNs are experiencing throughput (or packet retransmission) issues.
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