831 WAN limits

[silverhairbp]

I know that the 831 WAN connection is a 10mb ethernet. I'm getting 5mb on a 6mb DSL connection through the router, 6mb when a single computer is connected directly to the DSL modem interface.

Is the 831 WAN actually limited to 5mb in either direction?

TIA,

Bill

 

[burtsbees]

The 831 is a 10MB router because of the 10MB LAN interface---you're getting 5 out of 6 because of the distance you are from the C.O. of the adsl provider---if you were closer, you'd get closer to 6MB. That's the nature of adsl---nothing to do with the router. If you were to upgrade to 10MB service, you'd probably get closer to 9MB, actual dl speed.

Burt

 

[silverhairbp]

Thanks. I just found it interesting that a computer connected directly to our DSL modem got a full 6mb.

Bill

 

[burtsbees]

Sorry...did not read it well...that is interesting indeed...not sure then. Can you post a config? I'm sure there is no policy map in place, but just to be sure there's nothing else...

Burt

 

[silverhairbp]

Hi Burt,

I found it interesting enough to wonder whether the 10mb WAN connection was a total of downstream and upstream.

I'm not really worried about getting a full 6mbs as much as I am curious about the interface. This is of particular interest as available bandwidth [to consumers] seems to be increasing beyond 6mbs.

When we converted from cable to DSL a couple of months ago, I made the mistake of reconfiguring the router from the set-up you provided me last fall to a more or less default configuration through CRWS. Since it seemed to work, I just left it alone.

Here's the running config:

Current configuration : 3098 bytes
!
version 12.3
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname 831router
!
boot-start-marker
boot-end-marker
!
no logging buffered
enable secret 5 $1$Zt0Y$rXLIXtdOzRsbaYtspTZid/
!
no aaa new-model
ip subnet-zero
ip name-server 192.168.1.254
ip dhcp excluded-address 10.10.10.1
ip dhcp excluded-address 10.10.10.1 10.10.10.99
ip dhcp excluded-address 10.10.10.151 10.10.10.254
!
ip dhcp pool CLIENT
import all
network 10.10.10.0 255.255.255.0
default-router 10.10.10.1
lease 0 2
!
!
ip inspect name myfw cuseeme timeout 3600
ip inspect name myfw ftp timeout 3600
ip inspect name myfw rcmd timeout 3600
ip inspect name myfw realaudio timeout 3600
ip inspect name myfw smtp timeout 3600
ip inspect name myfw tftp timeout 30
ip inspect name myfw udp timeout 15
ip inspect name myfw tcp timeout 3600
ip inspect name myfw h323 timeout 3600
ip audit po max-events 100
no ftp-server write-enable
!
!
partition flash 2 10 2
!
username 831router password 7 03145A1815182E5E4A
username CRWS_Giri privilege 15 password 7 09081F4D2E5411334F0355251801383267734051405A560F0D00
username CRWS_Shashi privilege 15 password 7 1453434F3B552C0A6027623A1136171752500E090D020258514D
username CRWS_Gayatri privilege 15 password 7 041F5A4238704A6F4D165418212E1C05787B717F606D7A425540
!
!
no crypto isakmp enable
!
!
!
interface Ethernet0
ip address 10.10.10.1 255.255.255.0
ip nat inside
no cdp enable
hold-queue 32 in
!
interface Ethernet1
ip address dhcp client-id Ethernet1
ip access-group 111 in
ip nat outside
ip inspect myfw out
duplex auto
no cdp enable
!
ip classless
ip http server
no ip http secure-server
ip nat inside source list 102 interface Ethernet1 overload
!
!
access-list 23 permit 10.10.10.0 0.0.0.255
access-list 102 permit ip 10.10.10.0 0.0.0.255 any
access-list 111 permit icmp any any administratively-prohibited
access-list 111 permit icmp any any echo
access-list 111 permit icmp any any echo-reply
access-list 111 permit icmp any any packet-too-big
access-list 111 permit icmp any any time-exceeded
access-list 111 permit icmp any any traceroute
access-list 111 permit icmp any any unreachable
access-list 111 permit udp any eq bootps any eq bootpc
access-list 111 permit udp any eq bootps any eq bootps
access-list 111 permit udp any eq domain any
access-list 111 permit esp any any
access-list 111 permit udp any any eq isakmp
access-list 111 permit udp any any eq 10000
access-list 111 permit tcp any any eq 1723
access-list 111 permit tcp any any eq 139
access-list 111 permit udp any any eq netbios-ns
access-list 111 permit udp any any eq netbios-dgm
access-list 111 permit gre any any
access-list 111 deny ip any any
no cdp run
!
control-plane
!
!
line con 0
exec-timeout 120 0
no modem enable
transport preferred all
transport output all
stopbits 1
line aux 0
transport preferred all
transport output all
line vty 0 4
access-class 23 in
exec-timeout 120 0
login local
length 0
transport preferred all
transport input all
transport output all
!
scheduler max-task-time 5000
!
end

 

[burtsbees]

I found it interesting enough to wonder whether the 10mb WAN connection was a total of downstream and upstream."
Where are you finding that it is a "10MB" router? What exactly does this documentation say? If it simply says "10MB router", I would be sure to bet that it means 10MB because of the ethernet interface on the LAN side...but I don't see anything in the config that would necessarily cause this...not sure what to say...

Burt

 

[silverhairbp]

http://www.cisco.com/en/US/prod/col...s4874/product_data_sheet09186a008010e5c5.html

Docs say that the 831 WAN side is a 10BASE-T interface.

Its got me baffled.

Bill

 

[burtsbees]

Got it---that just means that it is exactly like the LAN interface---10baseT, 1/2 duplex. That's another thing---with those, you may have to hard code the ethernet interface(s), at least the WAN side, for 1/2 duplex.
int e1
duplex half

or

int e1
half-duplex

One of those...but nothing should limit you. One more thing---see if this helps...

int e0
ip tcp adjust-mss 1452
ip mtu 1492
int e1
ip tcp adjust-mss 1452
ip mtu 1492

It may not take the ip tcp adjust-mss 1452, but the mtu should be lowered to at least 1492 for adsl.

Burt

Burt

 

[silverhairbp]

How our network is configured is with a DSL modem running into an 831 router WAN port. We then run one connection from the 831 LAN switch into an eight port 3Com gigabit OfficeConnect switch into the rest of the network.

I had been testing our internet bandwidth from a computer connected to the gigabit switch and by connecting directly to the DSL modem. When I connected the computer directly to the router, the bandwidth was up to 6mbs. Through the switch, 5mbs.

I swapped out the 3Com switch with a D-Link gigabit switch and the bandwidth was up to 6mbs.

Thanks for your suggestions. I should have tried this before but I didn't suspect a problem with a 3Com switch.

Bill

 

[burtsbees]

I see---perhaps the 3Com is one of those with either store and forward switching (or the slowest method---can't think), and also maybe has STP that can't be turned off, always sending "hello's".
In your case, MTU is likely controlled to 1492 in the modem.

Burt