[ale] IPv6 routing issues

[Michael H. Warfield]

On Fri, 2009-09-04 at 12:49 -0600, JK wrote:
> Thank you for your assistance, Mike.  addrs and routes below.

> Michael H. Warfield wrote:

> > 	Run the following and post them.  Sanitize them if you like,
> > personally, I don't care about mine, people can look up my v6 addresses
> > in my DNS just like all my v4 address.  My space is 2001:4830:3000::/48
> > from OCCAID.
> > 
> > 	Run the following.
> > 
> > 	ip -6 addr ls
> > 	ip -6 route ls


> Note, I'm behind a NAT DSL modem/router; I hope that's not the
> problem.  My impression is that once the tunnel is up the
> IP4 NAT should not be an issue.

	Ah crud.  That would be the problem.  Sit tunnels do not work reliable
from behind a NAT.  Many NAT's can handle it, many NAT'S can not.  It's
a crap shoot.  You need to switch your configuration to UDP mode.  It
should be a setting in your tspc.conf file somewhere.

	Mike

> eth0 is the interface connected to the DSL box.
> 
> eth1 is local.
> 
> wlan2 is talking to a wifi router in front of a TWRR cable
> connection, but it's just a backup and doesn't have anything
> routed through it at the moment.
> 
> The default IP4 route goes out eth0 through the DSL box.
> 
> 
> jk at polymath #  ip -6 addr ls
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436
>      inet6 ::1/128 scope host
>         valid_lft forever preferred_lft forever
> 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
>      inet6 fe80::2a0:ccff:fedb:bed0/64 scope link
>         valid_lft forever preferred_lft forever
> 3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
>      inet6 2001:5c0:1504:e100::1/64 scope global
>         valid_lft forever preferred_lft forever
>      inet6 fe80::224:8cff:fe0a:6dfa/64 scope link
>         valid_lft forever preferred_lft forever
> 12: wlan2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
>      inet6 fe80::2a1:b0ff:feab:1117/64 scope link
>         valid_lft forever preferred_lft forever
> 14: sit1 at NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1280
>      inet6 2001:5c0:1400:b::3f71/128 scope global
>         valid_lft forever preferred_lft forever
>      inet6 fe80::c0a8:6572/64 scope link
>         valid_lft forever preferred_lft forever
>      inet6 fe80::c0a8:6604/64 scope link
>         valid_lft forever preferred_lft forever
>      inet6 fe80::af7:1/64 scope link
>         valid_lft forever preferred_lft forever
> 
> jk at polymath #  ip -6 route ls
> 2001:5c0:1400:b::3f71 via :: dev sit1  proto kernel  metric 256  mtu 1280 advmss 1220 hoplimit 
> 4294967295
> 2001:5c0:1504:e100::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
> 2001:5c0:1504:e100::/56 dev eth0  metric 1  mtu 1500 advmss 1440 hoplimit 4294967295
> 2000::/3 dev sit1  metric 1024  mtu 1280 advmss 1220 hoplimit 4294967295
> fe80::/64 dev eth1  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
> fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
> fe80::/64 dev wlan2  proto kernel  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
> fe80::/64 via :: dev sit1  proto kernel  metric 256  mtu 1280 advmss 1220 hoplimit 4294967295
> default dev sit1  metric 1024  mtu 1280 advmss 1220 hoplimit 4294967295
> 
> 
> > 	I'm a Fedora / rpm / sysv init person so it may be a little more
> > challenging for me to figure out whats wrong on that Ubuntu box.
> 
> 
> Well, I'm doing all this manually at the moment.  I tend to keep my
> own set of setup scripts and invoke them from /etc/rc.local, in order
> to avoid having to care about SysV vs BSD init stuff when I switch
> distros/machines.  Once I get things working manually and understand
> why they work, I add them to my scripts. So I don't care how all this
> fits into the Ubuntu init stuff; I just want to generally understand
> how to set up an IP6 tunnel and route traffic thru it.
> 
> -- JK
> 
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-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
   /\/\|=mhw=|\/\/          | (678) 463-0932 |  http://www.wittsend.com/mhw/
   NIC whois: MHW9          | An optimist believes we live in the best of all
 PGP Key: 0x674627FF        | possible worlds.  A pessimist is sure of it!
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