Hurricane Electric's IPv6 Tunnel Broker Forums

Advanced search  

News:

Welcome to Hurricane Electric's Tunnelbroker.net forums!

Author Topic: Your IPv4 endpoint is unreachable or unstable  (Read 7709 times)

aziaja

  • Newbie
  • *
  • Posts: 4
Your IPv4 endpoint is unreachable or unstable
« on: January 26, 2009, 04:12:35 AM »
...
« Last Edit: April 06, 2009, 04:27:15 AM by aziaja »
Logged

kristiankrohn

  • Newbie
  • *
  • Posts: 31
Re: Your IPv4 endpoint is unreachable or unstable
« Reply #1 on: January 26, 2009, 05:00:40 AM »
You should allow protocol 41 (IPv6) packets from the HE endpoint:

Code: [Select]
iptables -A INPUT -s $IPv4_of_TunnelBroker -p ipv6 -j ACCEPT
Otherwise IPv6 traffic will only flow if you sent the first packet, in which case your ESTABLISHED,RELATED rule would be used.
Logged

snarked

  • Hero Member
  • *****
  • Posts: 806
Re: Your IPv4 endpoint is unreachable or unstable
« Reply #2 on: January 26, 2009, 11:30:25 AM »
Agreed.  Also, your rule:
Quote
iptables -I INPUT 1 -s 127.0.0.0/8 -d 127.0.0.0/8 -j ACCEPT
might not be the best choice to permit looped back packets.

Try these:
Quote
-A INPUT  -j ACCEPT -i lo
-A OUTPUT -j ACCEPT -o lo

-A INPUT  -j ACCEPT -p ipv6 -s tserv15.lax1.ipv6.he.net  (I use this tunnel)
-A OUTPUT -j ACCEPT -p ipv6 -d tserv15.lax1.ipv6.he.net (you could restrict this further)
and in "/etc/protocols":
Quote
ipv6    41      IPV6            # ipv6
You should also get used to using iptables-restore instead of separate commands; it's more efficient for bringing up a firewall all at once.
Logged