Bug 24130
| Summary: | rc.network6 assumes single ipv6 interface is always the first interface | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Leo Bicknell <bicknell> |
| Component: | conf | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | ||
| Priority: | Normal | ||
| Version: | 4.2-RELEASE | ||
| Hardware: | Any | ||
| OS: | Any | ||
On Sun, Jan 07, 2001 at 03:09:10PM -0500, bicknell@ufp.org wrote: > ipv6_network_interfaces="fxp1" > > Due to the following code in /etc/rc.network6: > > # > # manual configurations - in case ip6_gateway_enable=NO > # you can configure only single interface, > # as specification assumes that > # autoconfigured host has single interface only. > # > set `ifconfig -l` > ipv6_network_interfaces="$1" > > The code will override the ipv6_network_interfaces="fxp1" with > ipv6_network_interfaces="fxp0" (the first interface in the box) in these > lines. The code quote above is only run if you have ipv6_network_interfaces set to auto. Since you are setting this variable to fxp1 it should not be run. Maybe you are seeing some other configuration problem? David. On Sun, Jan 07, 2001 at 03:09:10PM -0500, bicknell@ufp.org wrote: [Sorry if you get this twice - I think my first reply got eaten.] > ipv6_network_interfaces="fxp1" > > Due to the following code in /etc/rc.network6: > > # > # manual configurations - in case ip6_gateway_enable=NO > # you can configure only single interface, > # as specification assumes that > # autoconfigured host has single interface only. > # > set `ifconfig -l` > ipv6_network_interfaces="$1" > > The code will override the ipv6_network_interfaces="fxp1" with > ipv6_network_interfaces="fxp0" (the first interface in the box) in these > lines. Note - the code you quote is only run if ipv6_network_interfaces is set to auto. If you are setting ipv6_network_interfaces to fxp1 then you shouldn't have any other interfaces configured (though you might want to add lo0 to the list for the sake of completeness). David. On Sun, Jan 07, 2001 at 11:00:02PM +0000, David Malone wrote: > The code quote above is only run if you have ipv6_network_interfaces > set to auto. Since you are setting this variable to fxp1 it should > not be run. Maybe you are seeing some other configuration problem? You're right, I didn't pay close enough attention. I'm working on troubleshooting now to find the exact cause of the problem, but notice something interesting already. If I set ipv6_enable="NO", fxp0 still gets an ipv6 link local address. I then removed /etc/rc.network6 (actually, made it a one line empty script) and tried again (with ipv6_enable="NO"), and I still get a link local address on fxp0 (not on fxp1 though). Is this intended? -- Leo Bicknell - bicknell@ufp.org Systems Engineer - Internetworking Engineer - CCIE 3440 Read TMBG List - tmbg-list-request@tmbg.org, www.tmbg.org State Changed From-To: open->closed Submitter is going to send in some PRs to supersede this one. |
IPv6 end hosts are only allowed to autoconfigure a single interface, as autoconfiguring multiple interfaces may result in network reachability issues. This is correctly documented in /etc/rc.network6. However, the code in /etc/rc.network6 assumes that an autoconfiguring host _has only one NIC_, which is not a correct assumption. In my enviornment, the IPv6 network is separate from the IPv4 network. As such the machine has two NIC's, one for IPv4 _only_, and one for IPv6 _only_. The IPv6 NIC is the second NIC in the box (fxp1). This does not violate the rule of having a single NIC for IPv6 autoconfiguration, but is not an allowed configuration by the current /etc/rc.network6 script. Fix: A simple hack would be to change set `ifconfig -l` to be set $ipv6_network_interfaces, allowing the second line to get the first specified interface, if more than one were specified. I believe more elaborte checking might be in order though, to allow lo0 to be configured as well, and to produce better warning / error messages. How-To-Repeat: Configure a box with two nics (the examples below assume fxp0 and fxp1). Try the following /etc/rc.conf config lines: network_interfaces="fxp0 lo0" ifconfig_fxp0="inet 209.249.106.101 netmask 255.255.255.240" defaultrouter="209.249.106.97" ipv6_enable="YES" ipv6_network_interfaces="fxp1" Due to the following code in /etc/rc.network6: # # manual configurations - in case ip6_gateway_enable=NO # you can configure only single interface, # as specification assumes that # autoconfigured host has single interface only. # set `ifconfig -l` ipv6_network_interfaces="$1" The code will override the ipv6_network_interfaces="fxp1" with ipv6_network_interfaces="fxp0" (the first interface in the box) in these lines. Note, it is unclear if ipv6_network_interfaces="fxp1" should really be ipv6_network_interfaces="fxp1 lo0", which makes more sense. The code does not seem to allow for this possibility either.