| Message ID | 4D8413BE.5000305@hp.com |
|---|---|
| State | RFC, archived |
| Delegated to: | David Miller |
| Headers | show |
Brian Haley <brian.haley@hp.com> wrote [03.18.11]: > On 03/18/2011 07:03 PM, Jim Westfall wrote: > > Hi > > > > On ipv4 the first ip added to a nic will be used as the source ip for > > new outbound connections. Any additional ips, in the same netblock, > > will be added as secondaries. > > > > ipv6 seems to have the opposite behavior. The last ipv6 ip added to a > > nic is be used for new outbound connections. > > > > ~# ip -6 addr list br0 > > 11: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 > > inet6 fe80::21a:64ff:fe12:54bd/64 scope link > > valid_lft forever preferred_lft forever > > > > ~# ip addr add 2600:c00:0:1::1101/64 dev br0 > > ~# traceroute6 www.kame.net | head -0 > > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets > > > > ~# ip addr add 2600:c00:0:1::1102/64 dev br0 > > ~# traceroute6 www.kame.net | head -0 > > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1102, 30 hops max, 16 byte packets > > > > ~# ip -6 addr list br0 > > 11: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 > > inet6 2600:c00:0:1::1102/64 scope global > > valid_lft forever preferred_lft forever > > inet6 2600:c00:0:1::1101/64 scope global > > valid_lft forever preferred_lft forever > > inet6 fe80::21a:64ff:fe12:54bd/64 scope link > > valid_lft forever preferred_lft forever > > > > This makes things a bit of a pita when dealing with floater ipv6 ips for > > HA. > > > > This there some way to change this behavior to be like ipv4 or force > > a specific ipv6 ip to be the default used for new outbound connections? > > According to commit 8a6ce0c083f5736e90dabe6d8ce077e7dd0fa35f it's done this > way for backward-compatibility - we used to always put new addresses at the > front, then we started sorting them by scope. I couldn't find in the archives > who needed the backward-compatible behavior (it was way back in 2006), but > Yoshifuji proposed it and I Acked it. > > You could see if this patch helps you out, but I'm not sure if changing this > would break someone else, you'd have to see about putting a knob to control > this. > > -Brian > > diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c > index 3daaf3c..8c7d5a5 100644 > --- a/net/ipv6/addrconf.c > +++ b/net/ipv6/addrconf.c > @@ -577,7 +577,7 @@ ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) > list_for_each(p, &idev->addr_list) { > struct inet6_ifaddr *ifa > = list_entry(p, struct inet6_ifaddr, if_list); > - if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) > + if (ifp_scope > ipv6_addr_src_scope(&ifa->addr)) > break; > } > Hi Your patch fixes it for me. # ip addr add 2600:c00:0:1::1101/64 dev eth0 ~# traceroute6 www.kame.net | head -0 traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets ~# ip addr add 2600:c00:0:1::1102/64 dev eth0 ~# traceroute6 www.kame.net | head -0 traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets ~# ip addr add 2600:c00:0:1::1103/64 dev eth0 ~# traceroute6 www.kame.net | head -0 traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets ~# ip -6 addr show dev eth0 3: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qlen 1000 inet6 2600:c00:0:1::1101/64 scope global valid_lft forever preferred_lft forever inet6 2600:c00:0:1::1102/64 scope global valid_lft forever preferred_lft forever inet6 2600:c00:0:1::1103/64 scope global valid_lft forever preferred_lft forever inet6 fe80::21a:64ff:fe12:54bd/64 scope link valid_lft forever preferred_lft forever thanks Jim -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Jim Westfall <jwestfall@surrealistic.net> writes: > Your patch fixes it for me. > > # ip addr add 2600:c00:0:1::1101/64 dev eth0 > ~# traceroute6 www.kame.net | head -0 > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets > > ~# ip addr add 2600:c00:0:1::1102/64 dev eth0 > ~# traceroute6 www.kame.net | head -0 > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets > > ~# ip addr add 2600:c00:0:1::1103/64 dev eth0 > ~# traceroute6 www.kame.net | head -0 > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets Does this also affect the selected address if use_tempaddr=2? Andreas.
Andreas Schwab <schwab@linux-m68k.org> wrote [03.19.11]: > Jim Westfall <jwestfall@surrealistic.net> writes: > > > Your patch fixes it for me. > > > > # ip addr add 2600:c00:0:1::1101/64 dev eth0 > > ~# traceroute6 www.kame.net | head -0 > > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets > > > > ~# ip addr add 2600:c00:0:1::1102/64 dev eth0 > > ~# traceroute6 www.kame.net | head -0 > > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets > > > > ~# ip addr add 2600:c00:0:1::1103/64 dev eth0 > > ~# traceroute6 www.kame.net | head -0 > > traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:0:1::1101, 30 hops max, 16 byte packets > > Does this also affect the selected address if use_tempaddr=2? > > Andreas. > I am new to using temp addresses, but it appears to be working as expected. With the interface down I set use_tempaddr=2, brought the interface up and added my 2 static ipv6 ips, then ran rdisc6 on the interface. This resulted in the following 13: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 00:10:18:17:a0:e6 brd ff:ff:ff:ff:ff:ff inet6 2600:c00:1002:2::101/64 scope global valid_lft forever preferred_lft forever inet6 2600:c00:1002:2::102/64 scope global valid_lft forever preferred_lft forever inet6 2600:c00:1002:2:210:18ff:fe17:a0e6/64 scope global dynamic valid_lft 2591996sec preferred_lft 604796sec inet6 2600:c00:1002:2:ccd2:cf82:efb0:8dc5/64 scope global temporary dynamic valid_lft 604796sec preferred_lft 85796sec inet6 fe80::210:18ff:fe17:a0e6/64 scope link valid_lft forever preferred_lft forever ~# traceroute6 www.kame.net traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:1002:2:ccd2:cf82:efb0:8dc5, 30 hops max, 16 byte packets It correctly sourced from 2600:c00:1002:2:ccd2:cf82:efb0:8dc5. I repeated the same steps but reset use_tempaddr=1 ~# traceroute6 www.kame.net traceroute to orange.kame.net (2001:200:dff:fff1:216:3eff:feb1:44d7) from 2600:c00:1002:2::101, 30 hops max, 16 byte packets For which 2600:c00:1002:2::101 was my first added static ip. In testing the above I observed that downing the interface resulted in all ipv6 addressing being removed. Is this expected? I can see removing the dynamic/temp addresses, but seems weird for the statics I added. thanks Jim -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 03/18/2011 11:35 PM, Jim Westfall wrote: > Brian Haley <brian.haley@hp.com> wrote [03.18.11]: >> On 03/18/2011 07:03 PM, Jim Westfall wrote: >>> Hi >>> >>> On ipv4 the first ip added to a nic will be used as the source ip for >>> new outbound connections. Any additional ips, in the same netblock, >>> will be added as secondaries. >>> >>> ipv6 seems to have the opposite behavior. The last ipv6 ip added to a >>> nic is be used for new outbound connections. <snip> >> According to commit 8a6ce0c083f5736e90dabe6d8ce077e7dd0fa35f it's done this >> way for backward-compatibility - we used to always put new addresses at the >> front, then we started sorting them by scope. I couldn't find in the archives >> who needed the backward-compatible behavior (it was way back in 2006), but >> Yoshifuji proposed it and I Acked it. >> >> You could see if this patch helps you out, but I'm not sure if changing this >> would break someone else, you'd have to see about putting a knob to control >> this. >> >> -Brian >> >> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c >> index 3daaf3c..8c7d5a5 100644 >> --- a/net/ipv6/addrconf.c >> +++ b/net/ipv6/addrconf.c >> @@ -577,7 +577,7 @@ ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) >> list_for_each(p, &idev->addr_list) { >> struct inet6_ifaddr *ifa >> = list_entry(p, struct inet6_ifaddr, if_list); >> - if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) >> + if (ifp_scope > ipv6_addr_src_scope(&ifa->addr)) >> break; >> } >> > > Hi > > Your patch fixes it for me. Then we need to get Yoshifuji to Ack it since he wanted the previous behavior of newest-added being first. -Brian -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 3daaf3c..8c7d5a5 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -577,7 +577,7 @@ ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) list_for_each(p, &idev->addr_list) { struct inet6_ifaddr *ifa = list_entry(p, struct inet6_ifaddr, if_list); - if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) + if (ifp_scope > ipv6_addr_src_scope(&ifa->addr)) break; }