Date: Wed, 10 Sep 2014 09:42:46 +1200 From: mailinglists@debank.tv To: freebsd-net@freebsd.org Subject: Performance problem with slow link behind fast gateway Message-ID: <a5d07d35c0e3f423e6782410a175fcd2@debank.tv>
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All, I'm seeing some performance problems with a slowish VPN connection behind a fast gateway, the setup looks like this: |----------------------------------| |-----------------------------| |client (zandbak) (DSL connection)| ---- 'VPN tunnel' ----- |Gateway (vps) using NAT on 1G|------ 'Internet' |----------------------------------| |-----------------------------| Transfers from the gateway to the client are reasonably fast (easily within usable range for me): root@zandbak:/usr/home/rob # scp rob@gateway:test_file ./ test_file 100% 10MB 445.2KB/s 00:23 Transfers from the internet to the gateway are fast: root@vps:/usr/home/rob # fetch -4 "http://149.20.53.23/pub/FreeBSD/releases/amd64/amd64/ISO-IMAGES/10.0/FreeBSD-10.0-RELEASE-amd64-bootonly.iso" FreeBSD-10.0-RELEASE-amd64-bootonly.iso 100% of 209 MB 10 MBps 00m20s But transfers from the client to the internet through the tunnel are showing a very degraded connection speed, the speed jumps up and down but averages at around 20kBps: root@zandbak:/usr/home/rob # fetch "http://149.20.53.23/pub/FreeBSD/ISO-IMAGES-amd64/10.0/FreeBSD-10.0-RELEASE-amd64-bootonly.iso" FreeBSD-10.0-RELEASE-amd64-bootonly.iso 0% of 209 MB 8275 Bps 07h27m I've tried to eliminate some variables: -VPN: tinc as a L2 VPN and openVPN as a L3 VPN, results are the same -NAT: pf and ipfw, results are the same I suspect that there's a problem with the fast link receiving too much data and once the buffers are full dropping packets although I'm not sure if this is actually the problem. My question is: how can I debug this issue? Below some system information, I can supply more info if needed Thanks! Rob Evers System info: Gateway: This is a VPS on KVM root@vps:/usr/home/rob # uname -a FreeBSD vps.debank.tv 10.0-STABLE FreeBSD 10.0-STABLE #5 r268727M: Wed Jul 16 13:17:24 NZST 2014 root@vps.debank.tv:/usr/obj/usr/src/sys/GENERIC amd64 root@vps:/usr/home/rob # ifconfig vtnet0 vtnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=6c00ab<RXCSUM,TXCSUM,VLAN_MTU,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6> ether 00:16:3c:55:17:b9 inet 192.227.xxx.xxx netmask 0xffffff00 broadcast 192.227.xxx.xxx inet6 fe80::216:3cff:fe55:17b9%vtnet0 prefixlen 64 scopeid 0x1 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet 10Gbase-T <full-duplex> status: active root@vps:/usr/home/rob # ifconfig tap0 tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=80000<LINKSTATE> ether 00:bd:61:01:00:00 inet6 fd7c:3e16:580b:4ccf::50 prefixlen 64 inet6 fe80::2bd:61ff:fe01:0%tap0 prefixlen 64 scopeid 0x4 inet 172.16.143.50 netmask 0xffffff00 broadcast 172.16.143.255 nd6 options=61<PERFORMNUD,AUTO_LINKLOCAL,NO_RADR> media: Ethernet autoselect status: active Opened by PID 61485 Client: This is a VM on bhyve root@zandbak:/usr/home/rob # uname -a FreeBSD zandbak 10.0-RELEASE-p7 FreeBSD 10.0-RELEASE-p7 #0: Tue Jul 8 06:37:44 UTC 2014 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64 root@zandbak:/usr/home/rob # ifconfig vtnet0 vtnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=80028<VLAN_MTU,JUMBO_MTU,LINKSTATE> ether 52:54:00:13:fd:78 inet 192.168.1.129 netmask 0xffffff00 broadcast 192.168.1.255 inet6 fe80::5054:ff:fe13:fd78%vtnet0 prefixlen 64 scopeid 0x1 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> media: Ethernet 10Gbase-T <full-duplex> status: active root@zandbak:/usr/home/rob # ifconfig tap0 tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=80000<LINKSTATE> ether 00:bd:3d:94:05:00 inet 172.16.143.55 netmask 0xffffff00 broadcast 172.16.143.255 nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL> media: Ethernet autoselect status: active Opened by PID 1411
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