I have a Cisco 806 router with the firewall IOS release 12.3(20). The Internet connection is Road Runner cable. Upload speeds are what they should be, 375 kbs to 484 kbs, but the download speeds are terrible, usually around 175 kbs. When attaching a computer directly to the cable modem, the computer gets 4 mbs or more download.
The IOS is doing ip inspect in and out, NAT, and no access-lists in or out (removed them for testing). No matter what I do, the download bandwidth does not go up. I even removed both ip inspects with no better download speeds.
Is this router just not up to the task or am I missing something? Ideas and suggestions are welcome.
Thank you for your reply and I appologize for not getting back to you sooner. MTU is 1500. I looked at old posts and many Cisco articles and tried to adjust MTU to 1492, but the "show interface" indicates the MTU is still 1500. I also played with the tcp-mss with no better results.
Below is the show interface. My running config, which was slightly edited to take out a few lines for security reasons is posted in another reply (too big for one post). The functionality of the script remains with interfaces and access-lists intact.
Ethernet0 is up, line protocol is up
Hardware is PQUICC Ethernet, address is 0009.b74d.fcce (bia 0009.b74d.fcce)
Description: Sailaway LAN Interface
Internet address is 10.10.10.1/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
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: 0/32/0/0 (size/max/drops/flushes); Total output drops: 0
Acording to the output, I found both interfaces are 10Mbps half-duplex. Can you double confirm the connected device is the same setting ?
Moreover, due to 806 is a low-end model, the performance is not high. Could you try to remove the "ip inspect" command from both Ethernet interface. Moreover, try to reconfigure the MTU to 1500 or just remove it. Because it is fixed by Ethernet interface. If the WAN side is DSL, you may need to configure it.
If you remove the "ip inspect" command and the router becomes faster then you may consider to disable this feature or upgrade the router to higher model. e.g. 85x or 87x model.
Connected devices are set to the same settings as the router - 10 Mbps, half-duplex. The ip inspect command was removed as was the MTU entry which attempted to change the MTU to 1492 but did not. The MTU has always been 1500.
After removing the commands, the speed increased by a factor of 6. The download speed is now over 1200 Kbs, which is still low for the broadband connection I have.
I guess the 806 is just not up to the challenge. That is surprising since I had a cheap $50 Linksys router on the line until a storm zapped it. Bandwidth measured with it in place frequently approached 5 Mbps download. Looks like it is time to deep six the Cisco router and buy its cheaper cousin.
You're welcome. I believe the Linksys router is a updated model and many of the processing may be hardware-based. And the 806 is outdated and even EOS, many processes are running on CPU, so more process will cause higher loading. And there are many features that you may not required but built-in the router, so it also slow down it.
If only for DSL Internet connection, Linksys may be better. Simplier is faster. Just my 2 cents. :)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...