GRE/IPSec Tunnel actual Bandwidth

jose cortes · ‎08-17-2011

Hi everybody, Currently I have two sites connected by a GRE/IPsec tunnel. One of the sites is connected to a symmetrical internet connection or !2Mbps. The other site is connected to a 100Mbps (download) 10Mbps (upload) internet connection. When I test the internet connecting a computer directly to the CPE (ot the Cisco router) the Speed Test shows around 100Mbps download and 11Mbps upload. When I try to transfer a file from one side of the tunnel to the other side, if the file size is around 600 MB the estimated time is around 3 hours that is a speed around 450Kbps. These are the tunnel interface statistics during the transfer (for one side): SLA_NAP1#sho int tunnel 9 Tunnel9 is up, line protocol is up Hardware is Tunnel Internet address is 172.21.1.30/30 MTU 1514 bytes, BW 384 Kbit, DLY 500000 usec, reliability 255/255, txload 71/255, rxload 245/255 Output queue: 0/0 (size/max) 5 minute input rate 1303000 bits/sec, 291 packets/sec 5 minute output rate 108000 bits/sec, 158 packets/sec Is this the actual Bandwidth or how can I figure out this using the Routers (without external tools). How can I improve the Bandwidth usage ??? Thanks and Regards Jose M Cortes

jose cortes · ‎08-17-2011

Sorry about the last post, the full edito failed.

Hi everybody,

Currently I have two sites connected by a GRE/IPsec tunnel. One of the sites is connected to a symmetrical internet connection or !2Mbps. The other site is connected to a 100Mbps (download) 10Mbps (upload) internet connection. When I test the internet connecting a computer directly to the CPE (ot the Cisco router) the Speed Test shows around 100Mbps download and 11Mbps upload.

When I try to transfer a file from one side of the tunnel to the other side, if the file size is around 600 MB the estimated time is around 3 hours that is a speed around 450Kbps. These are the tunnel interface statistics during the transfer (for one side):

SLA_NAP1#sho int tunnel 9

Tunnel9 is up, line protocol is up

Hardware is Tunnel

Internet address is 172.21.1.30/30

MTU 1514 bytes, BW 384 Kbit, DLY 500000 usec,

reliability 255/255, txload 71/255, rxload 245/255

Output queue: 0/0 (size/max)

5 minute input rate 1303000 bits/sec, 291 packets/sec

5 minute output rate 108000 bits/sec, 158 packets/sec

Is this the actual Bandwidth or how can I figure out this using the Routers (without external tools). How can I improve the Bandwidth usage ???

Thanks and Regards

Jose M Cortes

Edison Ortiz · ‎08-17-2011

You can be experiencing packet fragmentation which will degrade your throughput.

Please review this link and make the appropriate changes:

http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml

Additionally, it helps to know the type of hardware you are using at either end.