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Topics - rdk

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IPv6 on Linux & BSD & Mac / IPv6 tunnel delays, CentOS 7
« on: December 24, 2017, 01:14:02 PM »
Hi!

I recently changed way too many variables and now my IPv6 HE tunnel has very very high delay (~750 ms).

I changed ISPs from Charter to AT&T for fiber speeds and I built a new router and installed Centos 7 (was FC17).

Tunnel is up and working but when I ping across it, I see delays on order of 750ms.

IPv4 traceroute to my tunnel endpoint shows 38ms delay.

IPv4 traceroute to my tunnel endpoint with proto=41 shows delay about 30ms.

This leads me to conclude that its something getting groked in my CentOS7 box.

Any suggestions or pointers as to what might be causing these large delays?  My configuration is fairly similar to my old box.  One small change though is that my external interface is a non-routable subnet to my modem.  I don't believe my modem is introducing the delays because of the traceroute data above.

Thanks,

Bobby

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Hi!

I've been struggling to understand this for a few days now.

I have an HE IPv6 tunnel and its really nice.  (Thanks by the way).

I have a /48 and use a mixture of autoconf and static IPv6 addresses.

I noticed the other day that I could not get to t-mobile.com website from my desktop.  I dug further and it appears that incapsula is blocking my queries.  I have a static IPv6 address 2001:470:e499:1::7b

On a windows 10 PC, I have a EUI-64 or privacy/autoconf IPv6 address.  It could talk just fine to the t-mobile website via my HE tunnel.

As soon as I configured the windows 10 box to use a static assigned IPv6 address  2001:470:e499:2::75 and not the autoconf one, the t-mobile website stopped responding.  When I re-enabled autoconf address on this box, started working again.

From other devices in my network (ipads, linux laptops, android phones), I can get to the t-mobile website.  These devices all have auto-configured IPv6 addresses.

t-mobile's website is behind an incapsula proxy of some sort.

Why would incapsula block some IPv6 addresses in my net and not others?  Seems like a strange security parameter or setting.

Note that I can ping6 any of these ipv6 website addresses and they respond so I don't believe its a IP-layer issue.

Same goes for trying to connect to www.incapsula.com -- blocks static ipv6 addresses, allows dynamic ipv6 addresses.  They won't respond to support emails since I'm not a customer.  And, would not be fun to try to get through the phalanx of support people at t-mobile to get them to explain whats going on either.

Hoping some folks in HE land have heard of this.

I can post data to back up my hypothesis if need be.

Thanks,

Bobby

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