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Forum Discussion
Orbi RBR20 v2.5.1.16 IPv6 PPPoE missing TCPMSS
Orbi RBR20 firmware v2.5.1.16
WAN PPPoE IPv4+IPv6 - VDSL Provider - LiveTIM - Sao Paulo - Brazil
IPv4, IPv6 and IPv6-PD (LAN) are aquired as expected
I have no throuble in IPv4 services, everything works well, but many IPv6 portals fail.
I used the https://orbilogin.net/debug.htm to capture packets and enable telnet service, also used an ODROID N2 (1 built-in and 1 usb ethernet) running ArchLinux ARM where I had lots of tools to throubleshooting support.
Results
I discovered that Orbi OS (based on OpenWrt Chaos Calmer) does not implement a simple ip6tables rule, responseble for IPv6 packet size adjust during a connection negotiation, what sometimes terminate in timeouts others in resets.
Workaround
Each time the PPPoE is established (not only after reboots), log into Orbi OS by using telnet and add the missing ip6tables rule:
ip6tables -A POSTROUTING -o ppp0 -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
Question
As I discovered this issue days after my 90 days support finished, I'm unable to report this bug through an official channel. How could I persist this soluction?
Retired_Member wrote:Question
As I discovered this issue days after my 90 days support finished, I'm unable to report this bug through an official channel. How could I persist this soluction?
What seems to have worked in this situation is to send a private message to one of the forum moderators by clicking on their screen name, such as Dustin_V (the moderators have a capital "N" after their name). Moderators seem to have a mechanism to communicate with Netgear engineers and support staff.
9 Replies
Retired_Member wrote:Question
As I discovered this issue days after my 90 days support finished, I'm unable to report this bug through an official channel. How could I persist this soluction?
What seems to have worked in this situation is to send a private message to one of the forum moderators by clicking on their screen name, such as Dustin_V (the moderators have a capital "N" after their name). Moderators seem to have a mechanism to communicate with Netgear engineers and support staff.