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--- networking:mtu_test [2014/09/18 11:46]
gcooper
+++ networking:mtu_test [2025/03/10 12:14] (current)
gcooper
@@ Line 7: / Line 7: @@
 :!: MTU issues can interfere with SSH connections.
-**MTU** is the maximum packet size.
+**MTU** (maximum transmission unit) is the maximum Ethernet frame size.
-**MSS** is the maximum data bytes carried within a packet. **1472** is fairly safe.  Less than that is problematic due to fragmentation.
+**MSS** (maximum TCP segment size) is the maximum data bytes carried within a TCP packet. **1472** is fairly safe.  Less than that is problematic due to fragmentation.
-^Connection  ^MTU     ^MSS      ^Note                                   ^
+^Connection   ^MTU     ^MSS      ^Note                                       ^
-|DSL (PPPoE) |1492    |1464     |PPPoE = 8 bytes, Breaks Exchange SMTP  |
+|DSL (PPPoE)  |1492    |1464     |PPPoE = 8 bytes, Breaks Exchange SMTP      |
-|Cable       |1500    |1472     |                                       |
+|Cable        |1500    |1472     |Should cause no issues with fragmentation  |
-|IPSec VPN   |1446    |1418     |Mikrotik, No effort at optimization    |
+|IPSec VPN    |1446    |1418     |Mikrotik, No effort at optimization        |
+|Jumbo Frames |9000    |8972     |Used for storage networks, Max throughput  |
+{{ :networking:mtu.png?direct&750 |MTU Chart}}
 ===== Linux =====
@@ Line 47: / Line 50: @@
 ===== Windows =====
+https://support.microsoft.com/en-us/help/900926/recommended-tcp-ip-settings-for-wan-links-with-a-mtu-size-of-less-than
 <file>
-ping -f -l 8792 <hostname or IP>
+ping -n 1 -f -l 8792 <hostname or IP>
 </file>
@@ Line 57: / Line 62: @@
 ==== For Windows ====
+https://www.iea-software.com/products/mtupath/
+<file>
+mtupath hostname.yourdomain.tld
+</file>
+http://www.elifulkerson.com/projects/mturoute.php
 <file>
-mturoute
+mturoute <hostname or IP>
+mturoute -t <hostname or IP>
 </file>
@@ Line 65: / Line 79: @@
 <file>
-tracepath
+tracepath <hostname or IP>
-traceroute --mtu
+traceroute --mtu <hostname or IP>
 </file>

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