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)
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: