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i tried to capture packets when i download and upload at same time using tcpdump i noticed that downstream packets always takes the priority i want to invert that here are the packets: the ip 172.217.171.207 is for uploading a file and 66.111.2.15 is for download

07:15:15.243304 IP (tos 0x0, ttl 128, id 4070, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.1.101.52058 > 66.111.2.15.80: Flags [.], cksum 0x6521 (correct), ack 1169331, win 508, options [nop,nop,sack 1 {1170558:1174239}], length 0
07:15:15.243372 IP (tos 0x0, ttl 128, id 4071, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.1.101.52056 > 66.111.2.15.80: Flags [.], cksum 0x3a92 (correct), ack 1025772, win 513, options [nop,nop,sack 1 {1026999:1031907}], length 0
07:15:15.243380 IP (tos 0x0, ttl 128, id 4072, offset 0, flags [DF], proto TCP (6), length 52)
    192.168.1.101.52060 > 66.111.2.15.80: Flags [.], cksum 0x8888 (correct), ack 869944, win 508, options [nop,nop,sack 1 {871171:876079}], length 0
07:15:15.243418 IP (tos 0x0, ttl 128, id 30984, offset 0, flags [DF], proto TCP (6), length 1420)
    192.168.1.101.52119 > 172.217.171.207.443: Flags [.], cksum 0x8a29 (correct), seq 1480491:1481871, ack 94, win 508, length 1380
07:15:15.243574 IP (tos 0x0, ttl 55, id 0, offset 0, flags [DF], proto TCP (6), length 1267)
    66.111.2.15.80 > 192.168.1.101.52057: Flags [.], cksum 0x6090 (correct), seq 939883:941110, ack 0, win 256, length 1227: HTTP
07:15:15.243848 IP (tos 0x0, ttl 55, id 0, offset 0, flags [DF], proto TCP (6), length 1267)
    66.111.2.15.80 > 192.168.1.101.52056: Flags [.], cksum 0x773f (correct), seq 1031907:1033134, ack 1, win 256, length 1227: HTTP
07:15:15.243940 IP (tos 0x0, ttl 55, id 0, offset 0, flags [DF], proto TCP (6), length 1267)
  • Don't the two directions have completely independent queues anyway? – grawity Dec 2 at 10:42
  • Yes Pppoe has cake qdisc and lan doesn't have queue – Hosni Dec 2 at 10:56

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