DragonFlyBSD

On Wed, Dec 4, 2013 at 5:14 AM, wrote:

Issue #2611 has been reported by phma.

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Bug #2611: Change in IP address results in network not working
http://bugs.dragonflybsd.org/issues/2611

• Author: phma
• Status: New
• Priority: Normal
• Assignee:
• Category:
• Target version:
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  I'm on a satellite connection and am assigned a public IPv6 address and an
  IPv4 address in shared address space behind NAT. Occasionally the network
  goes down, and I get new addresses. This does not bother the Linux boxes
  (except that I have to edit /etc/hosts so that they know where each other
  are) but the DragonFly box is unable to reach any hosts except on the LAN,
  and that only on IPv6.

In IPv4, after the address change, a ping from 100.116.42.28 (Linux
laptop) to 100.116.42.26 (DragonFly box) is answered by a pong from
100.116.27.42 (DFly's old address, which no longer appears in ifconfig) to
100.116.42.28.

For IPv4, if you manually change the interface address, the routes
"associated" w/ that address's prefix route will be gone, e.g.

ifconfig iface0 inet 10.0.0.2
route add -net 192.168.1.0/24 10.0.0.1
ifconfig iface0 inet 10.0.0.3

Then the route to 192.168.1.0/24 is gone, you will have to manually add it
back.

The easiest way probably is to run /etc/rc.d/routing, which adds routes
listed in /etc/rc.conf, after you change your interface address manually.

Best Regards,
sephe

In IPv6, after the address change, the default gateway begins with fe80
instead of 2001. The attached files are:
routebad: the routing table (netstat -rn) after a previous address change
routegood: the routing table after rebooting
routebadagain: the routing table after the most recent address change.
After rebooting, I had to find the gateway by asking the Linux box and set
it manually; this may not be a bug, as normally zyxomma runs a tunnel, and
the IPv6 gateway was pointing to an address in the tunnel.

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Tomorrow Will Never Die

I ran "/etc/rc.d/routing restart" and tried pinging again. Again the packets are sent from 100.116.27.42 to 100.116.42.25.

I didn't manually change the address. It was changed by dhcp and rtadvd.

This is on zyxomma, which is running 3.7. I've booted darner, which is running 3.5; I'll let you know what darner does if this happens again. Sometime tomorrow I should be taking zyxomma and leopard to a DSL connection, which shouldn't have this problem. When I was on cable in Charlotte, the address usually changed only if the power went out, in which case I had to reboot them, or the cable was cut or jiggled.

Darner does not have the bug of sending an IPv4 packet with the old source address. It does have a default gateway beginning with fe80 after its address was changed on it, but that apparently does not cause a problem with only one network card.