Slow Internet file download using Cisco Router 1710 + PCI broadband router

I brought a new Cisco router 1710 and used it with a PCI broadband
router for Internet access. The file download speed from Internet is
really slow. When I replace the Cisco router with another broadband
router, it is much better.

Workstation 10.10.20.2 configs:
1. ip address: 10.10.20.2 netmask 255.255.255.0
2. default gateway: 10.10.20.1

Cisco router 1710 major configs:
1. ip route 0.0.0.0 0.0.0.0 192.168.0.3
2. interface Fast Ethernet 0: ip address 10.10.20.1 255.255.255.0
ip nat inside
3. interface Ethernet 0: ip address 192.168.0.7 255.255.0.0
ip nat outside
4. access-list 7 permit 10.10.20.0 0.0.0.255
ip nat inside source list 7 interface Ethernet 0 overload

PCI broadband router major configs:
1. interface LAN: ip address 192.168.0.3
2. interface WAN: ip address xxx.xxx.xxx.xxx (ISP assigned)
3. NAT: enabled

Thank you in advance
Regards

 

First thing /I/ would do is check "show interface" output for errors.

 

Are you using pppoe. If so, try "ip tcp adjust-mss 1452" on the interface
that connects to the internet.

 

Hi PES,

Thank you for your help. I am not using PPPoE. The ISP assigns fixed
IP to my broadband connection. The network diagram looks like:

10.10.2.0/24 <-> Cisco 1710 <-> 192.168.0.0/16 <-> PCI broadband
router <-> Internet

Regards

 

Hi Rik,

Q1. Thank you for your help. Here are the results. Is it normal to
have so many broadcasts received on Ethernet interface within 30 secs?

samsrt#sh int e0
Ethernet0 is up, line protocol is up
Hardware is PQUICC Ethernet, address is 0005.9a3c.f923 (bia
0005.9a3c.f923)
Internet address is 192.168.0.7/16
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 5/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10BaseT
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:04, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 212000 bits/sec, 4 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
999903 packets input, 366262858 bytes, 0 no buffer
Received 815018 broadcasts, 0 runts, 2 giants, 0 throttles
19270 input errors, 19268 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
693690 packets output, 72720727 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

samsrt#sh int f0
FastEthernet0 is up, line protocol is up
Hardware is PQUICC_FEC, address is 0005.9a3c.f922 (bia
0005.9a3c.f922)
Internet address is 10.10.20.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:04:00, output 00:00:06, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 1 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
657149 packets input, 68749515 bytes
Received 5317 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
226486 packets output, 268732760 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

***************** After 30 secs ***********************

samsrt# sh int e0
Ethernet0 is up, line protocol is up
Hardware is PQUICC Ethernet, address is 0005.9a3c.f923 (bia
0005.9a3c.f923)
Internet address is 192.168.0.7/16
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 4/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10BaseT
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:09, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 189000 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
999925 packets input, 366265202 bytes, 0 no buffer
Received 815040 broadcasts, 0 runts, 2 giants, 0 throttles
19270 input errors, 19268 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
693692 packets output, 72720847 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

samsrt#sh int f0
FastEthernet0 is up, line protocol is up
Hardware is PQUICC_FEC, address is 0005.9a3c.f922 (bia
0005.9a3c.f922)
Internet address is 10.10.20.1/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:04:18, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 1 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
657149 packets input, 68749515 bytes
Received 5317 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
226489 packets output, 268733302 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out


Q2. There are many strange accesses from 192.168.0.0/16 like this. Is
it caused by worm or virus on the network?

4d03h: %SEC-6-IPACCESSLOGP: list 101 denied udp 192.168.3.40(138) ->
192.168.255.255(138),
1 packet
4d03h: %SEC-6-IPACCESSLOGP: list 101 denied udp 192.168.3.1(138) ->
192.168.255.255(138),
1 packet
4d03h: %SEC-6-IPACCESSLOGP: list 101 denied udp 192.168.3.89(138) ->
192.168.255.255(138),
1 packet
4d03h: %SEC-6-IPACCESSLOGP: list 101 denied udp 192.168.3.29(138) ->
192.168.255.255(138),
1 packet
4d03h: %SEC-6-IPACCESSLOGP: list 101 denied udp 192.168.3.89(137) ->
192.168.255.255(137),
1 packet

Thank you
Regards
Sam

 

On Sat, 27 Dec 2003 06:52:06 -0600, Sam wrote:


inline

i wouldnt worry about that.

I would be willing to bet that "19270 input errors,
19268 CRC, 0 frame, 0 overrun, 0 ignored 0 input packets with" is
your performance problem. check speed/duplex or any other ethernet
troubleshooting steps that you employ.

depends on frequency, you could enable timestamps to determine. but most
likely, it is regular windows traffic, since the other router doesnt
suffer performance related issues.

 

Dear Rik,

Thank you for you help.
Would you please explain more on troubleshooting CRC errors and
speed/duplex? Do I need to match the speed/duplex between router
interface and switch port, or between the two router interfaces? Sorry
for I am a beginner in networking.

Thank you in advance
Regards
Sam