On Thu, 10 Feb 2011 12:15:52 GMT, David Freedman said:
> these people are doing this by design, I think thats the point I'm
> trying to get across, if you will never need to process TOOBIG in your
> design, there is no need to accept it.
And how many networks break PMTUD because their design says
HI Geroge,
Thanks for the input. Appreciate some more info wrt TCAM usuage if possible.
Another thought, I agree ip schema is individual preference, but I want to
know the best practise (vague term best practice). Personally even I am in
favor of /64 p-t-p.
Regards,
Vikas
On Wed, Feb 9, 2011 at 1
Iljitsch van Beijnum wrote:
> On 10 feb 2011, at 0:26, David Freedman wrote:
>
>>> Unless every packet you emit is ≤ the minimum MTU (1280), then, you need
>>> to be able to receive TOOBIG messages.
>
>> Can you think of a packet type I will emit from my publically numbered
>> backbone interface
On 10 feb 2011, at 0:26, David Freedman wrote:
>> Unless every packet you emit is ≤ the minimum MTU (1280), then, you need
>> to be able to receive TOOBIG messages.
> Can you think of a packet type I will emit from my publically numbered
> backbone interface which may solicit a TOOBIG that I'll h
> Unless every packet you emit is ¾ the minimum MTU (1280), then, you need
> to be able to receive TOOBIG messages.
Can you think of a packet type I will emit from my publically numbered
backbone interface which may solicit a TOOBIG that I'll have to care about?
I can only think of three cases,
On Feb 9, 2011, at 9:50 AM, David Freedman wrote:
> Iljitsch van Beijnum wrote:
>> On 9 feb 2011, at 18:30, David Freedman wrote:
>>
>>> (yes, even ICMP TOOBIG
>>> can be filtered safely if you have designed things in a sane way)
>>
>> NO.
>>
>> Even if you run with 1280-byte MTUs everywhere s
On Feb 9, 2011, at 9:30 AM, David Freedman wrote:
> I think the solution to all of these problems is really to use public
> addressing but filter access to it at your edge (yes, even ICMP TOOBIG
> can be filtered safely if you have designed things in a sane way)
>
Filtering ICMP TOOBIG is actual
Iljitsch van Beijnum wrote:
> On 9 feb 2011, at 18:30, David Freedman wrote:
>
>> (yes, even ICMP TOOBIG
>> can be filtered safely if you have designed things in a sane way)
>
> NO.
>
> Even if you run with 1280-byte MTUs everywhere so you'd think path MTU
> discovery wouldn't be needed, this c
On 9 feb 2011, at 18:30, David Freedman wrote:
> (yes, even ICMP TOOBIG
> can be filtered safely if you have designed things in a sane way)
NO.
Even if you run with 1280-byte MTUs everywhere so you'd think path MTU
discovery wouldn't be needed, this can still cause problems with IPv6-to-IPv4
t
I think the solution to all of these problems is really to use public
addressing but filter access to it at your edge (yes, even ICMP TOOBIG
can be filtered safely if you have designed things in a sane way)
Dave.
--
David Freedman
Group Network Engineering
Claranet Group
> > A /127 mask is still the best way to handle real point-to-point links
> > like SDH/SONET today, to avoid the ping-pong problem. Works fine with
> > Cisco and Juniper, not tried with other vendors.
> >
>
> Can you elaborate on this? What's the ping-pong problem?
This has been well covered in
On 9 Feb 2011, at 09:48, sth...@nethelp.no wrote:
>> Is there a NANOG FAQ we can add this to?
>>
>>> 1- Use Public Ipv6 with /122 and do not advertise to Internet
>>> 2- Use Public Ipv6 with /127 and do not advertise to Internet
>>
>> The all zeros address is the all routers anycast address
On 9 feb 2011, at 11:16, sth...@nethelp.no wrote:
> If you can get router ICMP handling changed such that the ICMP packet
> generated by traceroute is sent from the loopback address, we might
> be able to do without global scope addresses on router-to-router
> interfaces. But until then...
I'm pr
> > Global scope addresses on router-to-router interfaces are necessary
> > today for traceroute to work. Some ISPs are *requiring* working
> > traceroute (without MPLS hiding of intermediate hops) in RFPs to
> > transit providers.
> >
> > If you can get router ICMP handling changed such that the I
On Wed, 9 Feb 2011, sth...@nethelp.no wrote:
A /127 mask is still the best way to handle real point-to-point links
like SDH/SONET today, to avoid the ping-pong problem. Works fine with
Cisco and Juniper, not tried with other vendors.
I know it's immature, but I can't wait for some new hire a
> > A /127 mask is still the best way to handle real point-to-point links
> > like SDH/SONET today, to avoid the ping-pong problem. Works fine with
> > Cisco and Juniper, not tried with other vendors.
>
> I know it's immature, but I can't wait for some new hire at vendor C or
> vendor J to reread
On 9 feb 2011, at 10:48, sth...@nethelp.no wrote:
>> The all zeros address is the all routers anycast address so on most
>> non-Cisco routers you can't use it, ruling out /127. The top 128 addresses
>> in any subnet are also reserved anycast addresses although they don't do
>> much in practice.
> Is there a NANOG FAQ we can add this to?
>
> > 1- Use Public Ipv6 with /122 and do not advertise to Internet
> > 2- Use Public Ipv6 with /127 and do not advertise to Internet
>
> The all zeros address is the all routers anycast address so on most non-Cisco
> routers you can't use it, ruling
On 9 feb 2011, at 5:24, Vikas Sharma wrote:
> I am looking for the recommendation for core interfaces IP addressing schema
> for Ipv6. Some different views are (PE- P - PE, point to point link) as
> below -
Is there a NANOG FAQ we can add this to?
> 1- Use Public Ipv6 with /122 and do not adver
On Tue, Feb 8, 2011 at 10:24 PM, Vikas Sharma wrote:
> Hi, > I am looking for the recommendation for core interfaces IP addressing
> schema
> for Ipv6. Some different views are (PE- P - PE, point to point link) as
> below -
> 1- Use Public Ipv6 with /122 and do not advertise to Internet
> 2- U
> I am looking for the recommendation for core interfaces IP addressing
> schema
> for Ipv6. Some different views are (PE- P - PE, point to point link)
as
> below -
>
> 1- Use Public Ipv6 with /122 and do not advertise to Internet
> 2- Use Public Ipv6 with /127 and do not advertise to Internet
>
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