Can't browse certaing sites through dialer interface

Unanswered Question
Jan 30th, 2008

Hi all. For the past 30 days my users cannot browse to a short list of sites.

The only oddity is that they use a dialer to route the traffic through.

Attached is the config.

The issue started 30 days ago with

We have tried using the DNS with no change in behavior.

Any ideas?

I have this problem too.
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Paolo Bevilacqua Wed, 01/30/2008 - 15:25


please configure under dialer1:

ip tcp adjust-mss 1452.

Hope this helps, please rate post if it does!

slayerhawk Thu, 01/31/2008 - 13:04

I'm using 12.3(XT2) with a cisco 1750 router.

Can I just set MTU to 1452?

Paolo Bevilacqua Thu, 01/31/2008 - 13:42

The IOS that you have supports the mss-adjust.

The symptoms are typical of the problem, please enable it on the ethernet inside and if doesn't work, at least it's ruled out.

slayerhawk Fri, 02/01/2008 - 06:23

mtl01rt01ec(config-if)#ip tcp ?

compression-connections Maximum number of compressed connections

header-compression Enable TCP header compression

mtl01rt01ec(config-if)#ip tcp

This is what I get. No option for mss.

Paolo Bevilacqua Fri, 02/01/2008 - 06:28

So you were able to configure for dialer and not for ethernet ?

Also can you try "ip adjust-mss 1452" ?

slayerhawk Fri, 02/01/2008 - 06:32

These are the options that I have.

Yeah, the dialer has been in place for two years.

mtl01rt01ec(config-if)#ip ?

Interface IP configuration subcommands:

access-group Specify access control for packets

accounting Enable IP accounting on this interface

address Set the IP address of an interface

authentication authentication subcommands

bandwidth-percent Set EIGRP bandwidth limit

bgp BGP interface commands

broadcast-address Set the broadcast address of an interface

cef Cisco Express Fowarding interface commands

cgmp Enable/disable CGMP

directed-broadcast Enable forwarding of directed broadcasts

dvmrp DVMRP interface commands

hello-interval Configures IP-EIGRP hello interval

helper-address Specify a destination address for UDP broadcasts

hold-time Configures IP-EIGRP hold time

igmp IGMP interface commands

irdp ICMP Router Discovery Protocol

load-sharing Style of load sharing

mask-reply Enable sending ICMP Mask Reply messages

mrm Configure IP Multicast Routing Monitor tester

mroute-cache Enable switching cache for incoming multicast packets

mtu Set IP Maximum Transmission Unit

multicast IP multicast interface commands

nat NAT interface commands

nhrp NHRP interface subcommands

ospf OSPF interface commands

pgm PGM Reliable Transport Protocol

pim PIM interface commands

policy Enable policy routing

probe Enable HP Probe support

proxy-arp Enable proxy ARP

rarp-server Enable RARP server for static arp entries

redirects Enable sending ICMP Redirect messages

rgmp Enable/disable RGMP

rip Router Information Protocol

route-cache Enable fast-switching cache for outgoing packets

rsvp RSVP interface commands

rtp RTP parameters

sap Session Advertisement Protocol interface commands

sdr Session Directory Protocol interface commands

security DDN IP Security Option

split-horizon Perform split horizon

summary-address Perform address summarization

tcp TCP header compression parameters

unnumbered Enable IP processing without an explicit address

unreachables Enable sending ICMP Unreachable messages

urd Configure URL Rendezvousing

verify Enable per packet validation

vrf VPN Routing/Forwarding parameters on the interface

wccp WCCP interface commands

Paolo Bevilacqua Fri, 02/22/2008 - 14:59

Sorry, it should be "ip tcp adjust-mss" under eth interface. If you don't have the option, need to upgrade IOS.

slayerhawk Fri, 03/07/2008 - 10:57

I'm using a dialer interface to pass credentials to the dsl provider.

Paolo Bevilacqua Fri, 03/07/2008 - 11:37

Ok, were you able to put the above suggested mss-adjust commands in the lan interface ?


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