[AusNOG] Telstra ADSL MTU

[Adam Baxter]

Thank you!

On 2 August 2016 at 15:39, Nathan Brookfield <
Nathan.Brookfield at simtronic.com.au> wrote:

> Hi Adam,
>
>
> As a rule your mss-adjust should be 40 bytes lower than your actual MTU.
> In theory you should have 1492 on the dialer and and an mss-adjust of 1452
> on the LAN interface.
>
>
> If you're going to keep 1452 on the Dialer as the MTU you should adjust
> the mss appropriately.  See if that helps at all.
>
>
> Kindest Regards,
>
> Nathan Brookfield (VK2NAB)
>
>
>
> Chief Executive Officer
>
> Simtronic Technologies Pty Ltd
>
>
>
> *Local:* (02) 4749 4949 *|* *Fax:* (02) 4749 4950 *|* *Direct:* (02) 4749
> 4951
>
> *Web*: http://www.simtronic.com.au *|* *E-mail*:
> nathan.brookfield at simtronic.com.au
>
>
> ------------------------------
> *From:* AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Adam Baxter
> <adam1984 at gmail.com>
> *Sent:* Tuesday, 2 August 2016 3:35 PM
> *To:* AusNOG at lists.ausnog.net
> *Subject:* [AusNOG] Telstra ADSL MTU
>
> Hi All,
>
> I have had 2 Customers in the last few weeks that have had MTU problems.
> This is my Dialer interface.
>
> interface Dialer0
>  ip address negotiated
>  no ip redirects
>  no ip unreachables
>  no ip proxy-arp
>  ip mtu 1452
>  ip nat outside
>  ip virtual-reassembly
>  encapsulation ppp
>  load-interval 30
>  dialer pool 1
>  dialer-group 1
>  no cdp enable
>  ppp authentication chap callin
>  ppp chap hostname xxxx at direct.telstra.net
>  ppp chap password 7 xxxxx
> end
>
>  I have never had any problems accessing websites until the last few
> weeks. Does anyone know what might have changed at the Telstra end? I had
> to set  "ip tcp adjust-mss 1452" on the Dialer interface to make it work.
> Never had to in the past with a number of other connections. Perhaps I
> should have all along?
>
> Regards,
>
> Adam.
>
>
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