Router: FreeBSD 13 Network behind NAT: some Linux hosts Router: --------------------------------------- [root@balancer1:/etc]# ifconfig | grep -A1 vtnet | grep options options=4c079b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,TXCSUM_IPV6> options=4c079b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,TXCSUM_IPV6> Host behind NAT, several curl launches: --------------------------------------- [root@back1 server]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 527k 0 0 150k 0 17:55:26 0:00:03 17:55:23 150k^C [root@back1 server]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 671k 0 0 188k 0 14:15:29 0:00:03 14:15:26 188k^C [root@back1 server]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 1599k 0 0 198k 0 13:34:49 0:00:08 13:34:41 214k^C [root@back1 server]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 1647k 0 0 225k 0 11:56:44 0:00:07 11:56:37 218k^C [root@back1 server]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 1247k 0 0 134k 0 20:05:17 0:00:09 20:05:08 147k^C [root@back1 server]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 383k 0 0 185k 0 14:31:44 0:00:02 14:31:42 185k^C Router: ---------------------------------------------- [root@balancer1:/etc]# ifconfig vtnet0 -rxcsum [root@balancer1:/etc]# ifconfig vtnet1 -rxcsum [root@balancer1:/etc]# ifconfig vtnet1 -txcsum [root@balancer1:/etc]# ifconfig vtnet0 -txcsum Same host behind NAT: ---------------------------------------------- [root@back1 etc]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 3 9469M 3 309M 0 0 89.6M 0 0:01:45 0:00:03 0:01:42 89.6M^C [root@back1 etc]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 9469M 0 76.9M 0 0 85.2M 0 0:01:51 --:--:-- 0:01:51 85.2M^C [root@back1 etc]# curl --output /dev/null https://mirror.yandex.ru/centos/8.4.2105/isos/x86_64/CentOS-8.4.2105-x86_64-dvd1.iso % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 1 9469M 1 99.3M 0 0 123M 0 0:01:16 --:--:-- 0:01:16 123M^C Guess it's self-explanatory.
Are you sure this is a regression? I do not know of a single version of FreeBSD that works without turning off [rx|tx]csum and LRO.
Well... not sure at this moment. May be not a regression, but ...is there a bug for this ? BTW: Workaround: it's enough to only turn off the rxcsum [and LRO ?]. With txcsum also turned off the ssh session became unresponsive (though receiving works just fine).