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Ztrata packetu v rezimu bridge


Guest pycan

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Zdravim,

nedavno jsem si poridil vlastni router Asus RT-AX53U, ktery jsem umistil za Compal CH7465 (bridge). Na routeru mam OpenWrt v tovarnim nastaveni. Jak pri pripojeni pres Ethernet kabel, tak pres WiFi, pozoruji ztratu packetu citelnou predevsim v online hrani. Provedl jsem nejake testy pomoci mtr (`mtr -ezb4w -c 100 8.8.8.8`). Vysledky:

HOST: OpenWrt                                                    Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. AS???    ???                                                100.0   100    0.0   0.0   0.0   0.0   0.0
  2. AS16019  ip-xxx-xxx-xxx-xxx.bb.vodafone.cz (xxx.xxx.xxx.xxx) 5.0%   100    8.2   9.7   7.1  28.5   3.5
  3. AS???    pzmsc-rc-01-ae30.net.vodafone.cz (185.188.187.28)   4.0%   100   10.8  11.9   7.9  50.4   5.8
       [MPLS: Lbl 1208 TC 0 S u TTL 1]
  4. AS???    strig01-lag-13.net.vodafone.cz (185.188.187.244)   94.0%   100   16.1   9.6   7.8  16.1   3.2
  5. AS16019  te2-2.sitr00i.vodafone.cz (217.77.160.45)          95.0%   100    8.1  10.2   8.1  12.1   1.5
  6. AS16019  cst2-254-1.cust.vodafone.cz (31.30.254.1)          94.0%   100    8.5  11.0   8.5  22.4   5.6
  7. AS15169  142.250.164.176 (142.250.164.176)                   5.0%   100   12.1  12.4  10.0  21.5   2.7
  8. AS15169  172.253.50.253 (172.253.50.253)                     5.0%   100    9.2  11.2   8.2  38.0   4.0
  9. AS15169  142.251.224.123 (142.251.224.123)                   6.0%   100   10.3  10.7   8.0  29.7   3.3
 10. AS15169  dns.google (8.8.8.8)                                6.0%   100    7.9   8.7   7.1  23.3   2.6

Pokud jsem pripojeny primo ke Compal CH7465 (router mode):

HOST:--------------------------                                  Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. AS???    192.168.0.1                                        99.0%   100    6.2   6.2   6.2   6.2   0.0
  2. AS???    ???                                                100.0   100    0.0   0.0   0.0   0.0   0.0
  3. AS16019  ip-xxx-xxx-xxx-xxx.bb.vodafone.cz (xxx.xxx.xxx.xxx) 0.0%   100   11.7  14.5  10.7  26.8   3.7
  4. AS???    pzmsc-rc-01-ae30.net.vodafone.cz (185.188.187.28)   0.0%   100   13.7  16.1  11.6 153.1  14.1
       [MPLS: Lbl 1208 TC 0 S u TTL 1]
  5. AS???    strig01-lag-13.net.vodafone.cz (185.188.187.244)   92.0%   100   13.1  14.2  11.9  20.4   2.9
  6. AS16019  te2-2.sitr00i.vodafone.cz (217.77.160.45)          92.0%   100   11.3  12.8  11.3  13.9   0.9
  7. AS16019  cst2-254-1.cust.vodafone.cz (31.30.254.1)          94.0%   100   20.0  15.5  13.0  20.0   3.0
  8. AS15169  142.250.164.176                                     0.0%   100   17.2  16.5  13.0  88.7   8.0
  9. AS15169  172.253.50.255                                      0.0%   100   15.3  16.5  13.7  25.1   2.2
 10. AS15169  142.251.224.129                                     0.0%   100   17.4  14.2  11.8  26.6   2.2
 11. AS15169  dns.google (8.8.8.8)                                0.0%   100   13.0  12.2  10.7  19.3   1.4

 

Setkali jste se s tim nekdo? Napada vas, cim by to mohlo byt? Za kazdou radu nebo napad moc dekuji.

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Aktualne to na Compalu v rezimu bridge nepozoruji, ale pred par lety nebyl uplne neobvykly stav pozorovat ztraty pri provozovani v rezimu bridge. V tom modemu je bohuzel tragicky chipset i firkware. Pokud mate Compal v pronajmu, zkuste se s VF dohodnout na vymene kus za kus.

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Vyzkousim, diky. Resim to i na OpenWrt foru a tam jsme se bohuzel taky k nicemu lepsimu nedopracovali. Mam uz ho rok a pul, tak treba vymena pomuze.

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Na router to nevypada, neni tam nic custom, prochazel jsem logy a vse vypada v poradku. O to vic je zvlastni, ze jsem to dnes testoval znovu a k memu prekvapeni jsou vysledky mnohem lepsi. Porad tam k nejake ztrate dochazi, ale u posledniho skoku uz vubec. Zkusil jsem online hru a zadne lagy uz nepozoruji. K zadne zmene nedoslo, takze tezko soudit, cim to je/bylo.

  1. AS???    ???                                                100.0   100    0.0   0.0   0.0   0.0   0.0
  2. AS16019  ip-x-x-x-x.bb.vodafone.cz (x.x.x.x)                 1.0%   100    8.3   9.5   6.9  47.9   4.4
  3. AS???    pzmsc-rc-01-ae30.net.vodafone.cz (185.188.187.28)   0.0%   100   10.2  10.1   7.5  18.3   2.3
       [MPLS: Lbl 1208 TC 0 S u TTL 1]
  4. AS???    strig01-lag-13.net.vodafone.cz (185.188.187.244)   90.0%   100   11.1  10.4   7.6  18.3   3.7
  5. AS16019  te2-2.sitr00i.vodafone.cz (217.77.160.45)          91.0%   100    8.7   9.0   8.1  10.9   0.8
  6. AS16019  cst2-254-1.cust.vodafone.cz (31.30.254.1)          91.0%   100    9.0   9.9   8.4  13.0   1.4
  7. AS15169  142.250.164.176 (142.250.164.176)                   1.0%   100   10.5  11.9  10.2  19.2   2.0
  8. AS15169  172.253.50.253 (172.253.50.253)                     0.0%   100    9.1   9.9   8.2  16.6   1.8
  9. AS15169  142.251.224.123 (142.251.224.123)                   4.0%   100    8.7  10.0   8.0  19.1   2.1
 10. AS15169  dns.google (8.8.8.8)                                0.0%   100    7.7   8.2   7.1  16.1   1.7

 

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@pycan ztraty paketu "na ceste" nemusi byt reprezentativni, pokud cilovy server (posledni hop v traceroute) vykazuje nulovou ztratovost. Routery po ceste maji obvykle pro ICMP malou prioritu a nekdy ICMP ani neodpovidaji. Obvykle plati, ze skutecna ztratovost neni vyssi nez ztratovost na poslednim hopu.

Pro vylouceni problemu v OpenWRT muzete OpenWRT nechat jako router a jen menit rezimy na Compalu (bridge vs. router). V pripade Compalu jako routeru budete mit sice double NAT, ale ztratovost paketu by mela byt shodna (v obou pripadech nulova, pokud nejsou ztraty na trase).

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