Zpomalení odesílání e-mailu po IPv6 na GMail.com

[czechsys]

Ahoj

pouziva se postfix, log viz:

Kód: [Vybrat]

2024-08-14T08:24:44.684477+02:00 mail-21 postfix/smtp[1643510]: 4WkJ896Cb6z12dy: to=<>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c06::1a]:25, delay=131, delays=0.09/124/0.73/6.4
2024-08-14T08:24:44.832454+02:00 mail-21 postfix/smtp[1643522]: 4WkJ892hMCz12dw: to=<>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c06::1a]:25, delay=131, delays=0.13/124/0.71/7
2024-08-14T08:24:44.994732+02:00 mail-21 postfix/smtp[1643523]: 4WkJBb5FQRz12q7: to=<>, relay=aspmx.l.google.com[2a00:1450:4013:c05::1a]:25, delay=5.3, delays=0.1/0/1.1/4.1
2024-08-14T08:24:45.045530+02:00 mail-21 postfix/smtp[1643600]: 4WkJ8B2p9Pzyd5: to=<>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c06::1a]:25, delay=131, delays=0.1/127/1.3/2
2024-08-14T08:24:45.470351+02:00 mail-21 postfix/smtp[1643534]: 4WkJ8C2ph0z12f3: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=130, delays=0.09/129/0.14/0.65
2024-08-14T08:24:45.546614+02:00 mail-21 postfix/smtp[1643525]: 4WkJ8C6KV7z12f1: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=130, delays=0.1/129/0.14/0.58
2024-08-14T08:24:45.700825+02:00 mail-21 postfix/smtp[1643524]: 4WkJ8D3HTWz12f5: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=129, delays=0.1/128/0.14/0.52
2024-08-14T08:24:45.989935+02:00 mail-21 postfix/smtp[1643534]: 4WkJ8F1YCbz10kN: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=129, delays=0.1/128/0.14/0.31
2024-08-14T08:24:46.011989+02:00 mail-21 postfix/smtp[1643510]: 4WkJ8D6gJ3z12f4: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=129, delays=0.12/128/0.13/0.4
2024-08-14T08:24:53.440169+02:00 mail-21 postfix/smtp[1643527]: 4WkJ8B6KRLz12f0: to=<>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c06::1a]:25, delay=139, delays=0.1/129/1.4/8.3
2024-08-14T08:24:53.523205+02:00 mail-21 postfix/smtp[1643600]: 4WkJ8G3Mhmz10kR: to=<>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c06::1a]:25, delay=135, delays=0.1/127/0.73/6.8
2024-08-14T08:24:53.686717+02:00 mail-21 postfix/smtp[1643534]: 4WkJBr6nzVz12qV: to=<>, relay=aspmx.l.google.com[142.251.31.27]:25, delay=0.73, delays=0.1/0/0.17/0.45
2024-08-14T08:24:54.640306+02:00 mail-21 postfix/smtp[1643523]: 4WkJ8F3LJFz12f7: to=<>, relay=gmail-smtp-in.l.google.com[2a00:1450:4013:c06::1a]:25, delay=137, delays=0.1/128/3.4/5.5
2024-08-14T08:24:55.234540+02:00 mail-21 postfix/smtp[1643524]: 4WkJ8J3jdYz10kQ: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=135, delays=0.1/134/0.13/0.46
2024-08-14T08:24:55.814170+02:00 mail-21 postfix/smtp[1643523]: 4WkJ8K3Fv4z10kf: to=<>, relay=gmail-smtp-in.l.google.com[142.250.102.26]:25, delay=134, delays=0.1/134/0.14/0.44

Kdyz se posilaji jednotkove emaily, tak neni rozdil. Jakmile se posila bulk email, tak nam narusta fronta vuci gmail.com. Z nahodneho casoveho bloku je videt, ze emaily pro gmail.com ipv4 & ipv6 jsou v te same fronte. A hlavni rozdil je v tom, ze navazani spojeni pres ipv6 a zejmena odeslani je dost pomalejsi nez ipv4.

Nevidi nekdo obdobne chovani na svych serverech popr. dokaze odkazat na nejakou dokumentaci/diskuzi, podle ktere se da neco pripadne prenastavit (krome vypnuti ipv6)?

Diky

[Reklama]

[Radek Zajíc]

Prijde mi, ze se cas od casu Googlu rozbije IPv6 na postovni infrastrukture. Nedavno jsem nebyl schopny poslat mail z tiskarny pomoci Google SMTP (SubmissionS), v tcpdumpu z routeru jsem pak videl, ze tiskarna vsechno posle tak, jak ma, ale Google prestane odpovidat (neprijde ACK, po chvili probehne reset spojeni). Po par dnech se to "spravilo".

Tohle muze byt podobny problem.

[czechsys]

To asi bude jiny problem, tahle situace se zrejme tahne uz tydny. Aby nakonec nebyl nejaky problem v siti, ale preneseni emailu treba na ipv6 seznam.cz je napr. 0.07s, coz je nesrovnatelne s tim vypisem logu.

[LolPhirae]

Jakmile se posila bulk email, tak nam narusta fronta vuci gmail.com.

To bude patrně tím, že nemají zájem o to, aby jim lidi přes IPv6 posílali spam...