Categories
Linux Networking

Optimale MTU feststellen

Statt endloser ping-Orgien mit unterschiedlichen Paketgrössen erledigt tracepath die Suche nach der optimalen MTU mit einem Kommando:

otto@thinkpad-otto:~$ tracepath 88.151.64.34
 1:  10.0.3.44                                             0.110ms pmtu 1500
 1:  10.0.0.254                                            0.739ms 
 1:  10.0.0.254                                            0.961ms 
 2:  10.0.0.254                                            0.709ms pmtu 1300
 2:  192.168.5.254                                         1.479ms 
 3:  79.173.156.177                                        2.790ms 
 4:  806.gi0-1.managed-lns01.inx.dsl.enta.net             21.856ms 
 5:  806.gi4-37.interxion.dsl.enta.net                    21.036ms 
 6:  te2-3.interxion.core.enta.net                        21.271ms asymm  9 
 7:  te5-1.gs1.core.enta.net                              21.556ms asymm  8 
 8:  te5-8.telehouse-east2.core.enta.net                  47.876ms asymm  7 
 9:  te5-7.telehouse-north0.core.enta.net                 26.689ms asymm  8 
10:  te5-4.amsterdam.core.enta.net                        27.880ms asymm  9 
11:  te-0-1-0.peer1.sara.ams.man-da.net                   28.509ms asymm 10 
12:  te-1-3-0-400.core1.fra1.ix.f.man-da.net              35.467ms 
13:  ge-1-2-9-0.core1.fra3.de.smartterra.net              35.483ms 
14:  xe-0-0-2-501.core1.dus2.de.smartterra.net            38.502ms 
15:  ge1-910.j-3.dus2.hk-net.de                           44.076ms asymm 16 
16:  ge1-99.j-1.dus1.hk-net.de                            42.926ms asymm 17 
17:  wan1.fw-1.dus1.hk-net.de                             39.980ms 
18:  ns2.hk-net.de                                        41.161ms reached
     Resume: pmtu 1300 hops 18 back 47 

Danke Hendrik!

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