vnet NAT'd jails extremely slow, connection dies
Michael Grimm
trashcan at ellael.org
Tue Feb 5 17:47:43 UTC 2019
Farhan Khan <khanzf at gmail.com> wrote:
> On Mon, Feb 4, 2019 at 2:29 PM Farhan Khan <khanzf at gmail.com> wrote:
>> I have a jail NAT'd to a base system, but the connection is extremely
>> slow and frequently disconnects drops, whereas the base is fine has
>> perfectly fine connectivity.
>>
>> My configuration is as follows:
>> vtnet0: Has routeable IPv4 address and 172.16.0.1/16
>> Jail uses epair4b, base has epair4a. Jail's IP is 172.16.0.5/16.
>> The base and jail can ping each other.
>> bridge0: contains vtnet0 and epair4a.
>>
>> I have gateway_enable="YES"
>> My pf.conf is as follows:
>> nat pass from 172.16.0.0/16 to any -> (vtnet0)
>>
>> When I try to run clamav, the connectivity stalls after a few minutes
>> and eventually disconnects. I ran tcpdump on the bridge and saw a lot
>> of HTTP seq and ack packets but no actual data. I am not using IPv6
>> yet.
>
> Just to provide more context to my previous email, outside of the jail
> I can download the FreeBSD ISO installer image at 3 MBps. Within the
> jail it drops to 12KBps.
This sounds familiar to me ;-)
Please have a look at https://lists.freebsd.org/pipermail/freebsd-net/2017-December/049470.html
Solution in https://lists.freebsd.org/pipermail/freebsd-net/2017-December/049484.html
I ended up with the following additions to /boot/loader.conf (and a subsequent reboot):
# needs to become turned off (LRO) in order to restore tcp performance within VNET jails:
hw.vtnet.lro_disable="1"
hw.vtnet.tso_disable="1"
HTH,
Michael
More information about the freebsd-jail
mailing list