Difference between revisions of "Billion 8800NL R2"

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1,282 bytes added ,  13:12, 17 February 2017
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(Created page with "We started testing out this router Feb 2017. Below are some notes. ==Default Settings== {|class="wikitable" !colspan="2"|Default/Factory Settings |- !Username: |admin |- !Pa...")
 
 
[[Category:AA Routers]]
 
 
==Support for baby Jumbo frames (1508)==
This was a standard feature in the original BT supplied ECI and Huawei modems. This means that a PPP ethernet router which supports RFC 4638 can
run with an MTU of 1500.
 
We're not yet sure if the 7700NL supports and MTU of 1508, but we have asked (Feb 2017)
 
==PPP session ID cache bug 'packet accelerator'==
One problem we see with Broadcom based routers is that they have an
internal feature which is a 'packet accelerator' which causes problems when a PPPoE session finishes and a new one starts.
Ethernet frames containing IP packets with the same source and destination IP and port
combination that were used in the previous session are received with the
PPPoE Session-ID from the earlier session.
 
Our understanding of this, having talked to Huawei is that the problem
is with the 'packet accelerator' feature in the Broadcom chipset. It is
caching frame headers including the PPPoE Session-ID, but not checking
if the Session-ID is the same when searching for the entry in the cache
for subsequent packets. Unplugging the ethernet cable momentarily
resolves the problem - that action must trigger a cache flush in the
Broadcom chipset.
 
We're not yet sure if the 7700NL has this 'feature' enabled, but we have asked (Feb 2017)

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