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Unable to open some websites

Vikrant Ambhore
Level 1
Level 1

Hi All cisco Network Administrator,

I have a strange situation where some websites are not accessible, but most are fine
Two I can’t access are
www.qantas.com.au
www.godaddy.com
I thought it must be some kind of DNS issue as other websites work fine and at the normal speed,
i had same issue on another router but it has been solved  by changing MTU Value but on this router
I tried to change MTU but i didn't get any luck, 

Can you please have a look and try to solve this

ip dhcp pool data
   network 192.168.2.0 255.255.255.0
   default-router 192.168.2.1
   dns-server 192.168.2.2 61.88.88.88

!

!

ip name-server 63.203.35.55!

!

!

interface Dialer1
mtu 1492
ip address negotiated
ip mtu 1452
ip nat outside
ip virtual-reassembly
encapsulation ppp
ip route-cache flow
ip tcp adjust-mss 1452
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp chap refuse
ppp pap sent-username xxxxxxxxxxxx password xxxxxxxxx

crypto map vpnmap

!

!

interface BVI1
ip address 10.1.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly
!
interface BVI2
ip address 192.168.2.1 255.255.255.0
ip nat inside
ip virtual-reassembly

1 Accepted Solution

Accepted Solutions

Nagaraja Thanthry
Cisco Employee
Cisco Employee

Hello,

On your dialer interface, I see that you have set a TCP MSS value of 1452.

Your MTU for the interface is also 1452. Can you reduce the TCP MSS value to

1380 and see if that helps?

interface Dialer1

ip tcp adjust-mss 1380

Hope this helps.

Regards,

NT

View solution in original post

2 Replies 2

Nagaraja Thanthry
Cisco Employee
Cisco Employee

Hello,

On your dialer interface, I see that you have set a TCP MSS value of 1452.

Your MTU for the interface is also 1452. Can you reduce the TCP MSS value to

1380 and see if that helps?

interface Dialer1

ip tcp adjust-mss 1380

Hope this helps.

Regards,

NT

thanks

It's helpfull, can you suggest me how do this calculation

Regards

Vikrant Ambhore

Review Cisco Networking for a $25 gift card