I was going to test GRE/IPv6IP overhead impact, but unfortunately this was not possible because of poor routing performance in virtual environment.
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| Topology |
OS - Ubuntu running in ESXi 5
$ lsb_release -aVPC - VirtualBox 4.2.16 (installed from Ubuntu software)
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 13.10
Release: 13.10
Codename: saucy
$
bsd1, bsd2 - just little TCP tunned FreeBSD 9.3 hosts with nuttcp installedGNS3 0.8.6 - IdlePC is set correctly.
NIC: em0 - bridge to real Internet, em1 - Generic driver (udp tunnel) - to GNS network
3700-sw - Cisco 3700 image with NM-SW modules, running as switch
3600-router - Cisco 3600 running as router with 2 connected network
3700-router1 - Cisco 3700 running as router, emulating routing (multiple hop)
Case 1 - 3700-router
3700-router1
!
hostname 3700-router1
!
interface FastEthernet0/0
ip address 10.0.11.1 255.255.255.0
!
interface FastEthernet0/1
ip address 192.168.45.4 255.255.255.0
!
router eigrp 1
network 0.0.0.0
no auto-summary
!
3700-router1#sh ip route | b Ga
Gateway of last resort is not set
C 192.168.45.0/24 is directly connected, FastEthernet0/1
10.0.0.0/24 is subnetted, 2 subnets
C 10.0.11.0 is directly connected, FastEthernet0/0
D 10.0.12.0 [90/307200] via 192.168.45.5, 00:00:03, FastEthernet0/1
3700-router1#
3700-router2
!bsd-1
hostname 3700-router2
!
interface FastEthernet0/0
ip address 10.0.12.1 255.255.255.0
!
interface FastEthernet0/1
ip address 192.168.45.5 255.255.255.0
!
router eigrp 1
network 0.0.0.0
no auto-summary
!
3700-router2#sh ip route | be Ga
Gateway of last resort is not set
C 192.168.45.0/24 is directly connected, FastEthernet0/1
10.0.0.0/24 is subnetted, 2 subnets
D 10.0.11.0 [90/307200] via 192.168.45.4, 00:00:58, FastEthernet0/1
C 10.0.12.0 is directly connected, FastEthernet0/0
3700-router2#
root@bsd1:/home # ps aux | grep nuttcpbsd-2
root 1135 0.0 0.1 9464 1612 ?? Is 1:56AM 0:00.04 nuttcp -S
[root@bsd2 /etc]# traceroute -d 10.0.11.2
traceroute to 10.0.11.2 (10.0.11.2), 64 hops max, 40 byte packets
1 10.0.12.1 (10.0.12.1) 5.952 ms 11.310 ms 9.866 ms
2 192.168.45.4 (192.168.45.4) 30.097 ms 26.120 ms 30.400 ms
3 10.0.11.2 (10.0.11.2) 40.311 ms 35.755 ms 41.429 ms
[root@bsd2 /etc]# nuttcp -i5 -w2M 10.0.11.2
0.6250 MB / 5.01 sec = 1.0469 Mbps
0.6875 MB / 5.00 sec = 1.1535 Mbps
0.6250 MB / 5.00 sec = 1.0486 Mbps
0.6875 MB / 5.00 sec = 1.1535 Mbps
0.6875 MB / 5.00 sec = 1.1534 Mbps
3.3294 MB / 25.08 sec = 1.1134 Mbps 1 %TX 2 %RX 0 host-retrans 35.85 msRTT
Case 2 - 3600-router only
!
hostname 3600-router
!
!
interface FastEthernet0/0
ip address 10.0.11.1 255.255.255.0
!
interface FastEthernet1/0
ip address 10.0.12.1 255.255.255.0
!
3600-router#sh ip route | be Ga
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 2 subnets
C 10.0.11.0 is directly connected, FastEthernet0/0
C 10.0.12.0 is directly connected, FastEthernet1/0
3600-router#
bsd2
[root@bsd2 /etc]# traceroute -d 10.0.11.2
traceroute to 10.0.11.2 (10.0.11.2), 64 hops max, 40 byte packets
1 10.0.12.1 (10.0.12.1) 14.056 ms 9.827 ms 10.472 ms
2 10.0.11.2 (10.0.11.2) 19.577 ms 16.934 ms 20.501 ms
[root@bsd2 /etc]# nuttcp -i5 -t10 -w2M 10.0.11.2
10.1875 MB / 5.01 sec = 17.0739 Mbps
10.5625 MB / 5.00 sec = 17.7138 Mbps
23.0625 MB / 11.07 sec = 17.4797 Mbps 4 %TX 3 %RX 1 host-retrans 15.77 msRTT
[root@bsd2 /etc]#
Case 3 - 3700-sw only
3700-sw
!
hostname 3700-sw
!
interface FastEthernet1/0
!
interface FastEthernet1/1
!
3700-sw#sh ip int br | exc down
Interface IP-Address OK? Method Status Protocol
FastEthernet1/0 unassigned YES unset up up
FastEthernet1/1 unassigned YES unset up up
Vlan1 unassigned YES unset up up
3700-sw#
bsd2
root@bsd2:/usr/home/sc # ifconfig em1 | egrep 'netmask|media'
inet 10.0.11.22 netmask 0xffffff00 broadcast 10.0.11.255
media: Ethernet autoselect (1000baseT <full-duplex>)
root@bsd2:/etc # traceroute 10.0.11.2
traceroute to 10.0.11.2 (10.0.11.2), 64 hops max, 40 byte packets
1 10.0.11.2 (10.0.11.2) 1.721 ms 2.171 ms 1.258 ms
root@bsd2:/etc #
[root@bsd2 /etc]# nuttcp -i5 -w2m 10.0.11.2
82.8750 MB / 5.01 sec = 138.7858 Mbps
75.8125 MB / 5.00 sec = 127.1785 Mbps
169.6250 MB / 10.52 sec = 135.2339 Mbps 43 %TX 12 %RX 234 host-retrans 1.73 msRTT
[root@bsd2 /etc]#
Case 4 - speedtest done with real IPs
bsd1 and bsd2 have access to real network.
The test evaluate maximum throughput with real speedtest as destination (external nuttcp server guaranteed speed - 1Gbps )
[root@bsd2 /etc]# nuttcp -i5 -w2m NUTTCP_REAL_SERVER
nuttcp-r: v6.1.2: Error: unable to setsockopt SO_RCVBUF: No buffer space available
errno=55
nuttcp-r: Warning: receive window size 66608 < requested window size 2097152
72.5000 MB / 5.00 sec = 121.6295 Mbps
78.9375 MB / 5.00 sec = 132.4355 Mbps
153.2500 MB / 10.38 sec = 123.8164 Mbps 54 %TX 5 %RX 17 host-retrans 2.23 msRTT
[root@bsd2 /etc]#
Conclusion
So VPC in this case can generate up to 125 Mbps real traffic, but through GNS3 emultated routers is only 1 Mbps.
Dont even know where to look for some tuning. Anyone ?