Bug 170070
| Summary: | [regression] 9.1-PRERELEASE host cannot talk to itself over IPv6 (except on loopback) | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Mike Andrews <mandrews> |
| Component: | kern | Assignee: | George V. Neville-Neil <gnn> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | CC: | gonzo |
| Priority: | Normal | ||
| Version: | 9.1-PRERELEASE | ||
| Hardware: | Any | ||
| OS: | Any | ||
Responsible Changed From-To: freebsd-bugs->freebsd-net change synopsis and assign Responsible Changed From-To: freebsd-net->bz Claim. I am working on the bugfix. Hi,
unless you are using a cxgb or cxgbe card, the work around temporary
is to do:
ifconfig lo0 -rxcsum6 -txcsum6
I am working on a proper fix.
--
Bjoern A. Zeeb You have to have visions!
Stop bit received. Insert coin for new address family.
Workaround works, thanks :) Author: bz Date: Sat Jul 28 20:31:39 2012 New Revision: 238871 URL: http://svn.freebsd.org/changeset/base/238871 Log: Hardcode the loopback rx/tx checkum options for IPv6 to on without checking. This allows the FreeBSD 9.1 release process to move forward. Work around the problem that loopback connections to local addresses not on loopback interfaces and not on interfaces w/ IPv6 checksum offloading enabled would not work. A proper fix to allow us to disable the "checksum offload" on loopback for testing, measurements, ... as we allow for IPv4 needs to put in place later. Reported by: tuexen, Matthew Seaman (m.seaman infracaninophile.co.uk) Reported by: Mike Andrews (mandrews bit0.com), kib, ... PR: kern/170070 MFC after: 1 day X-MFC after: re approval Modified: head/sys/net/if_loop.c Modified: head/sys/net/if_loop.c ============================================================================== --- head/sys/net/if_loop.c Sat Jul 28 20:08:14 2012 (r238870) +++ head/sys/net/if_loop.c Sat Jul 28 20:31:39 2012 (r238871) @@ -257,10 +257,20 @@ looutput(struct ifnet *ifp, struct mbuf m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES; break; case AF_INET6: +#if 0 + /* + * XXX-BZ for now always claim the checksum is good despite + * any interface flags. This is a workaround for 9.1-R and + * a proper solution ought to be sought later. + */ if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { m->m_pkthdr.csum_data = 0xffff; m->m_pkthdr.csum_flags = LO_CSUM_SET; } +#else + m->m_pkthdr.csum_data = 0xffff; + m->m_pkthdr.csum_flags = LO_CSUM_SET; +#endif m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES6; break; case AF_IPX: @@ -446,15 +456,29 @@ loioctl(struct ifnet *ifp, u_long cmd, c ifp->if_capenable ^= IFCAP_RXCSUM; if ((mask & IFCAP_TXCSUM) != 0) ifp->if_capenable ^= IFCAP_TXCSUM; - if ((mask & IFCAP_RXCSUM_IPV6) != 0) + if ((mask & IFCAP_RXCSUM_IPV6) != 0) { +#if 0 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; - if ((mask & IFCAP_TXCSUM_IPV6) != 0) +#else + error = EOPNOTSUPP; + break; +#endif + } + if ((mask & IFCAP_TXCSUM_IPV6) != 0) { +#if 0 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; +#else + error = EOPNOTSUPP; + break; +#endif + } ifp->if_hwassist = 0; if (ifp->if_capenable & IFCAP_TXCSUM) ifp->if_hwassist = LO_CSUM_FEATURES; +#if 0 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) ifp->if_hwassist |= LO_CSUM_FEATURES6; +#endif break; default: _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscribe@freebsd.org" Hi, I have committed a workaround for the problem to HEAD. You can find the patch to apply to stable/9 here: http://people.freebsd.org/~bz/20120728-02.diff In case someone from re@ wants to approve it; please just reply to me. Everyone else at least CC: me and re. In case you have previously applied the -rxcsum6 -txcsum6 workaround you need to remove the from your startup script before rebooting! PLease test as soon as you can as we'll merge it to stable/9 for 9.1-RC1 almost instantly most likely and it would be good to know if it works for you as well. Thanks a lot and dorry for the problems, /bz PS: this most likely does not yet fix the AH issue. I'll be on that in a minute but that's for after -RC1 unless RC1 will be further delayed due to me:( -- Bjoern A. Zeeb You have to have visions! Stop bit received. Insert coin for new address family. MFC r238871: Hardcode the loopback rx/tx checkum options for IPv6 to on without checking. This allows the FreeBSD 9.1 release process to move forward. Work around the problem that loopback connections to local addresses not on loopback interfaces and not on interfaces w/ IPv6 checksum offloading enabled would not work. A proper fix to allow us to disable the "checksum offload" on loopback for testing, measurements, ... as we allow for IPv4 needs to put in place later. PR: kern/170070 Index: sys =================================================================== --- sys (revision 238871) +++ sys (working copy) Property changes on: sys ___________________________________________________________________ Modified: svn:mergeinfo Merged /head/sys:r238871 Index: sys/net/if_loop.c =================================================================== --- sys/net/if_loop.c (revision 238871) +++ sys/net/if_loop.c (working copy) @@ -257,10 +257,20 @@ looutput(struct ifnet *ifp, struct mbuf *m, struct m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES; break; case AF_INET6: +#if 0 + /* + * XXX-BZ for now always claim the checksum is good despite + * any interface flags. This is a workaround for 9.1-R and + * a proper solution ought to be sought later. + */ if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { m->m_pkthdr.csum_data = 0xffff; m->m_pkthdr.csum_flags = LO_CSUM_SET; } +#else + m->m_pkthdr.csum_data = 0xffff; + m->m_pkthdr.csum_flags = LO_CSUM_SET; +#endif m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES6; break; case AF_IPX: @@ -446,15 +456,29 @@ loioctl(struct ifnet *ifp, u_long cmd, caddr_t dat ifp->if_capenable ^= IFCAP_RXCSUM; if ((mask & IFCAP_TXCSUM) != 0) ifp->if_capenable ^= IFCAP_TXCSUM; - if ((mask & IFCAP_RXCSUM_IPV6) != 0) + if ((mask & IFCAP_RXCSUM_IPV6) != 0) { +#if 0 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; - if ((mask & IFCAP_TXCSUM_IPV6) != 0) +#else + error = EOPNOTSUPP; + break; +#endif + } + if ((mask & IFCAP_TXCSUM_IPV6) != 0) { +#if 0 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; +#else + error = EOPNOTSUPP; + break; +#endif + } ifp->if_hwassist = 0; if (ifp->if_capenable & IFCAP_TXCSUM) ifp->if_hwassist = LO_CSUM_FEATURES; +#if 0 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) ifp->if_hwassist |= LO_CSUM_FEATURES6; +#endif break; default: On Jul 28, 2012, at 10:41 PM, Bjoern A. Zeeb wrote: > Hi, >=20 > I have committed a workaround for the problem to HEAD. You can find > the patch to apply to stable/9 here: >=20 > http://people.freebsd.org/~bz/20120728-02.diff >=20 > In case someone from re@ wants to approve it; please just reply to me. > Everyone else at least CC: me and re. >=20 > In case you have previously applied the -rxcsum6 -txcsum6 workaround > you need to remove the from your startup script before rebooting! >=20 > PLease test as soon as you can as we'll merge it to stable/9 for > 9.1-RC1 almost instantly most likely and it would be good to know if > it works for you as well. >=20 > Thanks a lot and dorry for the problems, Hi Bjoern, I did some SCTP testing and this fix works for me... Best regards Michael > /bz >=20 >=20 > PS: this most likely does not yet fix the AH issue. I'll be on that > in a minute but that's for after -RC1 unless RC1 will be further > delayed due to me:( >=20 > --=20 > Bjoern A. Zeeb You have to have = visions! > Stop bit received. Insert coin for new address family. >=20 >=20 > MFC r238871: >=20 > Hardcode the loopback rx/tx checkum options for IPv6 to on without > checking. This allows the FreeBSD 9.1 release process to move = forward. > Work around the problem that loopback connections to local addresses > not on loopback interfaces and not on interfaces w/ IPv6 checksum = offloading > enabled would not work. > A proper fix to allow us to disable the "checksum offload" on = loopback > for testing, measurements, ... as we allow for IPv4 needs to put in > place later. >=20 > PR: kern/170070 >=20 > Index: sys > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- sys (revision 238871) > +++ sys (working copy) >=20 > Property changes on: sys > ___________________________________________________________________ > Modified: svn:mergeinfo > Merged /head/sys:r238871 > Index: sys/net/if_loop.c > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- sys/net/if_loop.c (revision 238871) > +++ sys/net/if_loop.c (working copy) > @@ -257,10 +257,20 @@ looutput(struct ifnet *ifp, struct mbuf *m, = struct > m->m_pkthdr.csum_flags &=3D ~LO_CSUM_FEATURES; > break; > case AF_INET6: > +#if 0 > + /* > + * XXX-BZ for now always claim the checksum is good = despite > + * any interface flags. This is a workaround for 9.1-R = and > + * a proper solution ought to be sought later. > + */ > if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { > m->m_pkthdr.csum_data =3D 0xffff; > m->m_pkthdr.csum_flags =3D LO_CSUM_SET; > } > +#else > + m->m_pkthdr.csum_data =3D 0xffff; > + m->m_pkthdr.csum_flags =3D LO_CSUM_SET; > +#endif > m->m_pkthdr.csum_flags &=3D ~LO_CSUM_FEATURES6; > break; > case AF_IPX: > @@ -446,15 +456,29 @@ loioctl(struct ifnet *ifp, u_long cmd, caddr_t = dat > ifp->if_capenable ^=3D IFCAP_RXCSUM; > if ((mask & IFCAP_TXCSUM) !=3D 0) > ifp->if_capenable ^=3D IFCAP_TXCSUM; > - if ((mask & IFCAP_RXCSUM_IPV6) !=3D 0) > + if ((mask & IFCAP_RXCSUM_IPV6) !=3D 0) { > +#if 0 > ifp->if_capenable ^=3D IFCAP_RXCSUM_IPV6; > - if ((mask & IFCAP_TXCSUM_IPV6) !=3D 0) > +#else > + error =3D EOPNOTSUPP; > + break; > +#endif > + } > + if ((mask & IFCAP_TXCSUM_IPV6) !=3D 0) { > +#if 0 > ifp->if_capenable ^=3D IFCAP_TXCSUM_IPV6; > +#else > + error =3D EOPNOTSUPP; > + break; > +#endif > + } > ifp->if_hwassist =3D 0; > if (ifp->if_capenable & IFCAP_TXCSUM) > ifp->if_hwassist =3D LO_CSUM_FEATURES; > +#if 0 > if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) > ifp->if_hwassist |=3D LO_CSUM_FEATURES6; > +#endif > break; >=20 > default: >=20 Author: bz Date: Sat Jul 28 23:11:09 2012 New Revision: 238876 URL: http://svn.freebsd.org/changeset/base/238876 Log: MFC r238871: Hardcode the loopback rx/tx checkum options for IPv6 to on without checking. This allows the FreeBSD 9.1 release process to move forward. Work around the problem that loopback connections to local addresses not on loopback interfaces and not on interfaces w/ IPv6 checksum offloading enabled would not work. A proper fix to allow us to disable the "checksum offload" on loopback for testing, measurements, ... as we allow for IPv4 needs to put in place later. PR: kern/170070 Approved by: re (kib) Modified: stable/9/sys/net/if_loop.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/net/if_loop.c ============================================================================== --- stable/9/sys/net/if_loop.c Sat Jul 28 22:42:52 2012 (r238875) +++ stable/9/sys/net/if_loop.c Sat Jul 28 23:11:09 2012 (r238876) @@ -257,10 +257,20 @@ looutput(struct ifnet *ifp, struct mbuf m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES; break; case AF_INET6: +#if 0 + /* + * XXX-BZ for now always claim the checksum is good despite + * any interface flags. This is a workaround for 9.1-R and + * a proper solution ought to be sought later. + */ if (ifp->if_capenable & IFCAP_RXCSUM_IPV6) { m->m_pkthdr.csum_data = 0xffff; m->m_pkthdr.csum_flags = LO_CSUM_SET; } +#else + m->m_pkthdr.csum_data = 0xffff; + m->m_pkthdr.csum_flags = LO_CSUM_SET; +#endif m->m_pkthdr.csum_flags &= ~LO_CSUM_FEATURES6; break; case AF_IPX: @@ -446,15 +456,29 @@ loioctl(struct ifnet *ifp, u_long cmd, c ifp->if_capenable ^= IFCAP_RXCSUM; if ((mask & IFCAP_TXCSUM) != 0) ifp->if_capenable ^= IFCAP_TXCSUM; - if ((mask & IFCAP_RXCSUM_IPV6) != 0) + if ((mask & IFCAP_RXCSUM_IPV6) != 0) { +#if 0 ifp->if_capenable ^= IFCAP_RXCSUM_IPV6; - if ((mask & IFCAP_TXCSUM_IPV6) != 0) +#else + error = EOPNOTSUPP; + break; +#endif + } + if ((mask & IFCAP_TXCSUM_IPV6) != 0) { +#if 0 ifp->if_capenable ^= IFCAP_TXCSUM_IPV6; +#else + error = EOPNOTSUPP; + break; +#endif + } ifp->if_hwassist = 0; if (ifp->if_capenable & IFCAP_TXCSUM) ifp->if_hwassist = LO_CSUM_FEATURES; +#if 0 if (ifp->if_capenable & IFCAP_TXCSUM_IPV6) ifp->if_hwassist |= LO_CSUM_FEATURES6; +#endif break; default: _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscribe@freebsd.org" On 7/28/2012 4:41 PM, Bjoern A. Zeeb wrote: > Hi, > > I have committed a workaround for the problem to HEAD. You can find > the patch to apply to stable/9 here: > > http://people.freebsd.org/~bz/20120728-02.diff > > In case someone from re@ wants to approve it; please just reply to me. > Everyone else at least CC: me and re. > > In case you have previously applied the -rxcsum6 -txcsum6 workaround > you need to remove the from your startup script before rebooting! > > PLease test as soon as you can as we'll merge it to stable/9 for > 9.1-RC1 almost instantly most likely and it would be good to know if > it works for you as well. > > Thanks a lot and dorry for the problems, > /bz Since I saw a commit to stable/9 I went ahead and updated and tried it, and it seems to work for me. State Changed From-To: open->suspended The workaround has been merged; thanks a lto for reporting and testing; I leave the PR in suspended to not forget to cleanly fix it eventually. Responsible Changed From-To: bz->gnn I shall not use bugzilla (at least until we will have a CLI). batch change: For bugs that match the following - Status Is In progress AND - Untouched since 2018-01-01. AND - Affects Base System OR Documentation DO: Reset to open status. Note: I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed. From my perspective (as the original submitter) yes, I'd consider it closed for years. Some of the other commenters hinted that they wanted to apply a better fix later. Not sure if that ever happened in the last six years; you'd have to ask them. There was a commit referencing this bug, but it's still not closed and has been inactive for some time. Closing as fixed. Please re-open it if the issue hasn't been completely resolved. |
With a 9.1-PRERELEASE (r238602) kernel built July 17, my systems cannot talk to themselves over IPv6 on anything except the loopback address. Other systems can talk to them fine, IPv4 works fine, and an older 9.0-STABLE (r236963) kernel built June 12, works fine. This is across a mix of Intel systems with a mix of NICs, mostly em and rl, but all amd64. Obviously this causes some bizarre problems, like hosts not being able to talk to their own jails, DNS failures if resolv.conf is pointed to a locally running named.... Fix: Revert kernel to r236963 or to IPv4. I have not yet narrowed down further the specific revision that breaks this. How-To-Repeat: IPs and domains redacted somewhat. root@whitedog:/etc # head -7 rc.conf ipv6_activate_all_interfaces="YES" cloned_interfaces="lagg0" ifconfig_re1="up -tso -rxcsum -txcsum mtu 5000" ifconfig_re0="up -tso -rxcsum -txcsum mtu 5000" ifconfig_lagg0="laggproto failover laggport re0 laggport re1 10.0.27.15/25 mtu 5000" ifconfig_lagg0_ipv6="inet6 YYYY:YYYY:Y:11b::fafa:330/64" ifconfig_lagg0_alias0="inet6 fc00::fafa:330/64" root@whitedog:/etc # ifconfig re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 5000 options=82098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE> ether XX:XX:XX:da:58:92 inet6 fe80::XXX:XXff:feda:5892%re0 prefixlen 64 scopeid 0x1 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active re1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 5000 options=82098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE> ether XX:XX:XX:da:58:92 inet6 fe80::XXX:XXff:feda:5892%re1 prefixlen 64 scopeid 0x2 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active ipfw0: flags=8801<UP,SIMPLEX,MULTICAST> metric 0 mtu 65536 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x8 inet 127.0.0.1 netmask 0xff000000 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 5000 options=82098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE> ether XX:XX:XX:da:58:92 inet 10.0.27.15 netmask 0xffffff80 broadcast 10.0.27.127 inet6 fe80::XXX:XXff:feda:5892%lagg0 prefixlen 64 scopeid 0x9 inet6 YYYY:YYYY:Y:11b::fafa:330 prefixlen 64 inet6 fc00::fafa:330 prefixlen 64 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect status: active laggproto failover lagghash l2,l3,l4 laggport: re1 flags=0<> laggport: re0 flags=5<MASTER,ACTIVE> root@whitedog:/etc # telnet 10.0.27.15 22 Trying 10.0.27.15... Connected to whitedog.int.OURDOMAIN.com. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host. root@whitedog:/etc # telnet 127.0.0.1 22 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host. root@whitedog:/etc # telnet ::1 22 Trying ::1... Connected to localhost. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host. root@whitedog:/etc # telnet fc00::fafa:330 22 Trying fc00::fafa:330... telnet: connect to address fc00::fafa:330: Operation timed out telnet: Unable to connect to remote host root@whitedog:/etc # telnet YYYY:YYYY:Y:11b::fafa:330 22 Trying YYYY:YYYY:Y:11b::fafa:330... telnet: connect to address YYYY:YYYY:Y:11b::fafa:330: Operation timed out telnet: Unable to connect to remote host root@whitedog:/etc # telnet fe80::XXX:XXff:feda:5892%lagg0 22 Trying fe80::XXX:XXff:feda:5892... telnet: connect to address fe80::XXX:XXff:feda:5892: Operation timed out telnet: Unable to connect to remote host root@whitedog:/etc # uname -a FreeBSD whitedog.int.OURDOMAIN.com 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #44 r238602: Wed Jul 18 17:18:20 EDT 2012 root@beer.int.OURDOMAIN.com:/usr/obj/usr/src/sys/BLAH64 amd64 root@whitedog:/etc # ipfw -a list 00100 463 68374 allow ip from any to any via lo0 00200 0 0 deny ip from any to 127.0.0.0/8 00300 0 0 deny ip from 127.0.0.0/8 to any 00400 0 0 deny ip from any to ::1 00500 0 0 deny ip from ::1 to any 00600 0 0 allow ipv6-icmp from :: to ff02::/16 00700 5 336 allow ipv6-icmp from fe80::/10 to fe80::/10 00800 2 208 allow ipv6-icmp from fe80::/10 to ff02::/16 00900 0 0 allow ipv6-icmp from any to any ip6 icmp6types 1 01000 41 2792 allow ipv6-icmp from any to any ip6 icmp6types 2,135,136 65000 1716 167475 allow ip from any to any 65535 0 0 deny ip from any to any From another system on the same subnet at the same time, though: root@beer:/etc # telnet 10.0.27.15 22 Trying 10.0.27.15... Connected to whitedog.int.OURDOMAIN.com. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host. root@beer:/etc # telnet fc00::fafa:330 22 Trying fc00::fafa:330... Connected to fc00::fafa:330. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host. root@beer:/etc # telnet YYYY:YYYY:Y:11b::fafa:330 22 Trying YYYY:YYYY:Y:11b::fafa:330... Connected to whitedog.int6.OURDOMAIN.com. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host. root@beer:/etc # telnet fe80::XXX:XXff:feda:5892%lagg0 22 Trying fe80::XXX:XXff:feda:5892... Connected to fe80::XXX:XXff:feda:5892%lagg0. Escape character is '^]'. SSH-1.99-OpenSSH_5.8p2_hpn13v11 FreeBSD-20110503 quit Protocol mismatch. Connection closed by foreign host.