Internet Dropouts.. Collision Count High?? on this Cisco 828 router??

Hi I am troubleshooting internet dropouts on our network. Bloomberg clients keep disconnecting and Im getting phones thrown at me each time it happens (well slight exageration)

I have the folllowing:

ISP - - -  Cisco 828 HSDL  - - -  Straight cable  - - - Cyberguard Snapgear SG560 Firewall

The Cisco is set to 10/half duplex.. The Cyberguard Firewall also 10/half duplex.

The ISP who manages this switch told me there is a problem with my firewall causing too many collissions...  

Any advice much appreciated. Cheers Wilson

The router has been on 20minutes.

See "show int eth0"  below:

User Access Verification

>show int eth0
Ethernet0 is up, line protocol is up
  Hardware is PQUICC Ethernet, address is 0011.5cf2.5a37 (bia 0011.5cf2.5a37)
  Description:  LAN
  Internet address is
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 9/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Half-duplex, 10Mb/s
  ARP type: ARPA, ARP Timeout 04:00:00
  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: fifo
  Output queue: 0/100 (size/max)
  5 minute input rate 385000 bits/sec, 41 packets/sec
  5 minute output rate 19000 bits/sec, 25 packets/sec
     256221 packets input, 204552633 bytes, 0 no buffer
     Received 408 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     201972 packets output, 101437225 bytes, 0 underruns
     0 output errors, 3736 collisions, 1 interface resets
     0 babbles, 0 late collision, 1358 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
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wilsonkjitAuthor Commented:
pinging isp's dns server I loose approx 10%. d'oh

replace cable between firewall and router.
90% of the time this is a speed/duplex issue.  Your e0/0 is 10Mbs half duplex.  Your firewall is probably auto or 100 full.

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wilsonkjitAuthor Commented:
Thanks for that.. I do try that though. New straight thru.

Would it usually be a straight thru between a router and a firewall??,, Maybe a crossover will be better?

wilsonkjitAuthor Commented:
The Cisco is set to 10/half duplex.. The Cyberguard Firewall was Auto but I set that to 10/half duplex, with no improvement.

wilsonkjitAuthor Commented:
I am right in saying the Collsion count is infact HIGH..3736? for a router powered up for only 20mins.  Does this look like my problem, or could this just be a red herring and the cause of my dropouts is somewhere else.

Your collision count is high.  Did you clear the counts after changing your firewall from auto to 10/half?
wilsonkjitAuthor Commented:
Thanks for the reply..
Not manually, I power cycled the router to clear the counter. You can see the collisions growing when I do a download or upload. 100 per minute rate.
Disconnect your LAN and then only connect one pc and start downloading. If CRC still increase you have to check the hardware interface on both devices.
wilsonkjitAuthor Commented:
Yes it ended up being a mismatched speed duplex setting, it took me a while to double check the advice given.

the Cisco 828 only supports 10mbps half duplex and the firewall was failing to auto negotiate.

Cheers for your help
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