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

Discussion in 'Cisco' started by Sam, Dec 27, 2003.

  1. Sam

    Sam Guest

    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
     
    Sam, Dec 27, 2003
    #1
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  2. Sam

    Rik Bain Guest


    First thing /I/ would do is check "show interface" output for errors.
     
    Rik Bain, Dec 27, 2003
    #2
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  3. Sam

    PES Guest

    Are you using pppoe. If so, try "ip tcp adjust-mss 1452" on the interface
    that connects to the internet.
     
    PES, Dec 27, 2003
    #3
  4. Sam

    Sam Guest

    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
     
    Sam, Dec 27, 2003
    #4
  5. Sam

    Sam Guest

    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

     
    Sam, Dec 27, 2003
    #5
  6. Sam

    Rik Bain Guest

    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.
     
    Rik Bain, Dec 27, 2003
    #6
  7. Sam

    Sam Guest

    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
     
    Sam, Dec 29, 2003
    #7
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