Slow upload speed behind cisco router

Zeljko Popovic · ‎03-11-2013

Hi All,

I have working internet behind cisco 2811 on all vlans however upload speed is very slow and ftp server download is slow and times out, previously when directly connected to modem/router was fine, anyone there to help? This is router config below:

Current configuration : 2229 bytes

!

! Last configuration change at 02:21:18 UTC Tue Mar 12 2013

version 15.1

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname cfg-router

!

boot-start-marker

boot-end-marker

!

no aaa new-model

!

dot11 syslog

ip source-route

!

ip cef

!

no ipv6 cef

!

multilink bundle-name authenticated

!

voice-card 0

!

crypto pki token default removal timeout 0

!

license udi pid CISCO2811 sn FHK1419F3Y0

!

redundancy

!

interface FastEthernet0/0

no ip address

duplex auto

speed auto

!

interface FastEthernet0/0.10

encapsulation dot1Q 10

ip address 190.0.0.11 255.255.0.0

ip nat inside

ip virtual-reassembly in

!

interface FastEthernet0/0.20

encapsulation dot1Q 20

ip address 172.16.0.11 255.255.240.0

ip nat inside

ip virtual-reassembly in

!

interface FastEthernet0/0.30

encapsulation dot1Q 30

ip address 192.168.100.11 255.255.255.0

ip nat inside

ip virtual-reassembly in

!

interface FastEthernet0/0.40

encapsulation dot1Q 40

ip address 192.168.200.11 255.255.255.0

ip nat inside

ip virtual-reassembly in

!

interface FastEthernet0/1

ip address 192.168.0.21 255.255.255.0

ip nat outside

ip virtual-reassembly in

duplex auto

speed auto

!

no ip forward-protocol nd

no ip http server

no ip http secure-server

!

ip nat inside source list 1 interface FastEthernet0/1 overload

ip nat inside source list 2 interface FastEthernet0/1 overload

ip nat inside source list 3 interface FastEthernet0/1 overload

ip nat inside source list 4 interface FastEthernet0/1 overload

ip nat inside source list 101 interface FastEthernet0/1 overload

ip nat inside source static tcp 190.0.0.10 21 interface FastEthernet0/1 21

ip nat inside source static tcp 190.0.0.10 3389 interface FastEthernet0/1 3389

ip route 0.0.0.0 0.0.0.0 192.168.0.1

!

access-list 1 permit 190.0.0.0 0.0.255.255

access-list 2 permit 172.16.0.0 0.0.15.255

access-list 3 permit 192.168.100.0 0.0.0.255

access-list 4 permit 192.168.200.0 0.0.0.255

access-list 101 permit ip any any

!

control-plane

!

mgcp profile default

!

line con 0

line aux 0

line vty 0 4

login

transport input all

!

scheduler allocate 20000 1000

end

tobyarnett · ‎03-11-2013

You are likely getting your outside interface syncing up as half duplex due to your auto/auto config. Issue the

Show interface fa0/1

Check tho see what your duplex is coming up as. If it is half then hard code in a full duplex configuration.

Conf t
Into f0/1
Duplex full
End
!

You could also check your inside connection, but I think the outside link is likely your issue. Also check your logs for anything unusual.

Toby

Sent from Cisco Technical Support Android App

-Toby

Please don't forget to rate any helpful post.

_____________________________________
There are no great limits to growth because there are no limits of human intelligence, imagination, and wonder.
- Ronald Reagan

Zeljko Popovic · ‎03-11-2013

I set this up on duplex full, no change. For example when I ftp local address it is fast from one vlan to another however when I use outside address then very slow and drops out.

blau grana · ‎03-12-2013

Hello Zeljko,

I do not know if this will help, but your NAT configuration is little bit "wild".

try this ->

no ip nat inside source list 1 interface FastEthernet0/1 overload

no ip nat inside source list 2 interface FastEthernet0/1 overload

no ip nat inside source list 3 interface FastEthernet0/1 overload

no ip nat inside source list 4 interface FastEthernet0/1 overload

no ip nat inside source list 101 interface FastEthernet0/1 overload

!

no access-list 1 permit 190.0.0.0 0.0.255.255

no access-list 2 permit 172.16.0.0 0.0.15.255

no access-list 3 permit 192.168.100.0 0.0.0.255

no access-list 4 permit 192.168.200.0 0.0.0.255

no access-list 101 permit ip any any

!

ip access extended NAT_ACL

permit ip 190.0.0.0 0.0.255.255 any

permit ip 172.16.0.0 0.15.255.255 any

permit ip 192.168.100.0 0.0.0.255 any

permit ip 192.168.200.0 0.0.0.255 any

deny ip any any

!

route-map NAT_MAP

match ip add NAT_ACL

!

ip nat inside source route-map NAT_MAP Fa0/1 overload

Best Regards

Please rate all helpful posts and close solved questions

Best Regards Please rate all helpful posts and close solved questions

Zeljko Popovic · ‎03-12-2013

Hi Grana,

Thanks for this however it performs as same as the one I had before, testing upload speed to internet, ftp and rd still 10 times slower then when not behind router.

blau grana · ‎03-13-2013

What bandwidth does your link to internet have?

Towards what server are you testing it?

Can you perform this test?

Connect your laptop to router, to wan port Fa0/1 and configure laptop's interface with IP from this range 192.168.0.0/24.

And try now if connection from LAN is slow with some ftp file transfer.

If connection is still slow, it is caused definitely by router, if not we eliminated one point which could cause problems

Best Regards

Please rate all helpful posts and close solved questions

Best Regards Please rate all helpful posts and close solved questions

Zeljko Popovic · ‎03-13-2013

Hi Blau grana

Actually I found where the problem was, a faulty cable from router was causing an issue, as soon as I changed it everything went flying 10 times faster. Anyone who is interested can use above Config as functional, both versions mine and yours amended. Thanks for making an interest in trying to fix it.

Kind regards

Zeljko