[AusNOG] Not quite routing issue

[Lee]

Check http://www.lagado.com/proxy-test also, to expose sneaky/transparent  
proxies

On Mon, 22 Sep 2014 17:39:14 +1000, Matthew Moyle-Croft <mmc at mmc.com.au>  
wrote:

> Unsure, but maybe it's going via some transparent proxy?  If so, what
> does the output of going to http://www.whatsmyip.org/ look like?  If
> it's _not_ your original IP it'll at least give you the IP of the
> transparent proxy causing you issue?
>
> On Sun, Sep 21, 2014 at 11:18 PM, Michael J. Carmody
> <michael at mikeit.com.au> wrote:
>> Hey All,
>>
>>
>>
>> With the recent allotment of another APNIC subnet to our company, we  
>> have
>> been beating our head against an issue which has us stumped.
>>
>>
>>
>> In short a client on a layer-2 service cannot reach Facebook, Seek, ADP
>> Payroll portal and a bunch of other websites intermittently, but more  
>> often
>> not, than can…
>>
>>
>>
>> When we move them to our original  subnet range (same router, same  
>> layer 2
>> service, same client CPE) all is well.
>>
>>
>>
>> We original suspected a routing issue, but pings/traceroutes work. Then  
>> we
>> expected a MSS/MTU issue, but clamping all the way down to 1300 made no
>> difference.
>>
>>
>>
>> We then got weird and noticed we could get a response from the
>> loadbalancer/CDN/proxy of facebook, asking for a nonsense URL, but if we
>> asked for a valid URL we get no reply.
>>
>>
>>
>> So we seem to have an issue affecting Facebook, seek.com.au and ADP  
>> payroll,
>> that is not routing related (can ping/traceroute without an issue), not  
>> MTU
>> related, (can clamp up and down without any affect), but somehow  
>> related to
>> the IP range of CDN fronted services?
>>
>>
>>
>> 103.20.20.x/24 works for us and all our clients.
>>
>> 103.232.216.x/23 seems to work mostly with sporadic sites not loading.
>>
>>
>>
>> Same router, same upstream peer, same everything else…
>>
>>
>>
>> Can someone point out where our stupidity lies? We are very stumped  
>> here.
>>
>>
>>
>> -Michael Carmody
>>
>>
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>>
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-- 
Lee