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Kindly help me in improving my through tunnel throughput

Unanswered Question
Sep 5th, 2002
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Our two offices in two different cities, they are connected to eachother through internet bandwidth. At both the places, each office cisco router is connected with their near by ISP. Now we creat a GRE Tunnel from ethernet to ethernet for all data transfer between our offices internal network. here is my configuration at one side, the same is at other side.

GEO-LAHORE#show inter ser 0/0

Serial0/0 is up, line protocol is up

Hardware is PowerQUICC Serial

Description: 256k radio link->COMSATS LHR

Internet address is 210.56.31.21/30

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 6/255

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/41/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1158 kilobits/sec

5 minute input rate 41000 bits/sec, 3 packets/sec

5 minute output rate 5000 bits/sec, 5 packets/sec

177019 packets input, 137075922 bytes, 0 no buffer

Received 6483 broadcasts, 0 runts, 0 giants, 0 throttles

1 input errors, 0 CRC, 1 frame, 0 overrun, 0 ignored, 0 abort

171449 packets output, 19617553 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

GEO-LAHORE#sho inter tunnel 1

Tunnel1 is up, line protocol is up

Hardware is Tunnel

Description: 210.56.0.133

Internet address is 10.254.2.2/16

MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,

reliability 255/255, txload 28/255, rxload 85/255

Encapsulation TUNNEL, loopback not set

Keepalive set (10 sec)

Tunnel source 210.56.20.137 (FastEthernet0/0), destination 210.56.3.33

Tunnel protocol/transport GRE/IP, key disabled, sequencing disabled

Tunnel TTL 255

Checksumming of packets disabled, fast tunneling enabled

Last input 00:00:02, output 00:00:01, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/0, 32 drops; input queue 0/75, 0 drops

5 minute input rate 3000 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

20303 packets input, 7731177 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

23444 packets output, 3065630 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

GEO-LAHORE#


I am using EIGRP as routing protocol.

I have 256 kbps bandwith at each site. While browsing internet I get throughput 20 to 25 KBites, but when I transfer files suing ftp at our internal network, browse some our internal web site that uses tunnel offcource, the throughput is only 2 to 4 KBites. Both the tarffics, internet and intenal are routed through internet 256 Kbps bandwith but why I am getting different throughput. How can I improve the throughput of my tunnel to 20 to 25 KBites like normal normal internet browsing.

Kindly Help me out.

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aalbler Fri, 09/06/2002 - 01:20
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Hi,

I don't know the configuration but I had similar problems a year ago with the MTU size of the tunnel.

Try to reduce the MTU of the tunnel on both sides to 1470.

Also there were some bugs related to tunnel performance.

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