08-21-2014 11:10 AM - edited 03-04-2019 11:35 PM
**Edit**
To add more to this, somehow I missed it but I had quite a few CRC errors on the outside interface. I switched the FastEthernet0/0 to speed auto, duplex auto and now I am getting about 45Mbps download speed. I would still like to see the router get closer to 60 though, is there anything I could tweak in the config that might increase the speed of this just a little bit? Or is an 1841 only rated to about 45Mbps with all the firewall features turned on?
**End Edit**
A school I am doing some volunteer work for has a 60/4 coax internet service through Charter communication. I just put in an older Cisco 1841 router and used my default standard config I use at many other sites. For some reason I am only getting about 6 - 8 mbps download speeds with the router. When I plug directly into the cable modem with my laptop I am getting the advertised speeds.
Attached is my config, it looks pretty standard to me and for the life of me I can not see why this router would be performing so poorly. The CPU utilization is very low, I have to be missing something though.
Thank you everyone
08-21-2014 11:24 AM
Hi ,
Remove inspect rule and check ,
ip inspect fw_inspect out
else apply inspect rule on LAN interface towards in direction .
HTH
Sandy
08-21-2014 12:43 PM
I have tried this and I have not seen any noticeable speed improvements. Still sitting around roughly 7mbps speed. I just can not believe the 1841 is so old that it can not handle the connection speeds.
08-21-2014 07:37 PM
Hi ,
Router 1841 , should supports upto 75,000 PPS
http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf
ISR 1841 75,000 38.40 No
Check for Speed & duplex settings on your modem , Whether it negotiating with 100 Mbps speed & full duplex .
HTH
Sandy
08-29-2014 01:17 PM
I'm having the same issue with the 1841 I get about 12Megbit were I can get over 20 connected with a cheap old linksys router. If you look at the processor it's pegged at 100% after doing some research I found the 1841 has a slow CPU it's max is only 38meg that's not even natting. I assume when you nat the CPU is maxed out. My IP input shows 70% while downloading a 500meg file. I'm going to try an ASA5200
120 184159140 71050305 2591 66.79% 24.54% 6.34% 0 IP Input
999999996666699999999999999999999999999999999999666667777777
666999992222288888999999999988888555556666699999777779999911
100 ******** ***********************************
90 ******** ***********************************
80 ******** *********************************** *****
70 ******** ***********************************************
60 ************************************************************
50 ************************************************************
40 ************************************************************
30 ************************************************************
20 ************************************************************
10 ************************************************************
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per second (last 60 seconds)
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