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roELEo
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Joined: 28 Sep 2004
Posts: 42
Location: The Netherlands

PostPosted: Tue May 17, 2005 10:49 am    Post subject: network available - but localhost unreachable Reply with quote

Hi all,

Somewhere in the last few days I borked something. Now localhost is not accessible, while my internet connection just works. Pinging localhost leaves me with 100% package loss.

Some nmap:

Code:
marvin ~ # nmap localhost

Starting nmap 3.75 ( http://www.insecure.org/nmap/ ) at 2005-05-17 12:45 CEST
WARNING:  Could not determine what interface to route packets through to 127.0.0.1, changing ping scantype to ICMP ping only
pcap_open_live: ioctl: No such device


And:
Code:
marvin ~ # cat /etc/hosts
127.0.0.1       marvin  localhost       
# IPV6 versions of localhost and co
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts


My emerge info:

Quote:
Portage 2.0.51.19 (default-linux/x86/2005.0, gcc-3.4.3, glibc-2.3.5-r0, 2.6.11-gentoo-r8 i686)
=================================================================
System uname: 2.6.11-gentoo-r8 i686 AMD Athlon(tm) XP 2600+
Gentoo Base System version 1.4.16
Python: dev-lang/python-2.2.3-r1,dev-lang/python-2.3.5,dev-lang/python-2.4.1 [2.4.1 (#1, May 11 2005, 10:41:38)]
dev-lang/python: 2.2.3-r1, 2.3.5, 2.4.1
sys-apps/sandbox: [Not Present]
sys-devel/autoconf: 2.59-r6, 2.13
sys-devel/automake: 1.7.9-r1, 1.8.5-r3, 1.5, 1.4_p6, 1.6.3, 1.9.5
sys-devel/binutils: 2.15.92.0.2-r8
sys-devel/libtool: 1.5.14
virtual/os-headers: 2.6.8.1-r2
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.1/share/config /usr/kde/3.2/share/config /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config /usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config /usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/ /usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/ /usr/share/texmf/xdvi/ /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-O2 -march=athlon-xp -fomit-frame-pointer"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoaddcvs autoconfig ccache distlocks sandbox sfperms strict"
GENTOO_MIRRORS="http://ftp.snt.utwente.nl/pub/os/linux/gentoo ftp://ftp.snt.utwente.nl/pub/os/linux/gentoo rsync://ftp.snt.utwente.nl/gentoo"
LDFLAGS="-Wl,-O1"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage /usr/local/portage-gentopia"
SYNC="rsync://rsync.nl.gentoo.org/gentoo-portage"
USE="x86 3dnow X aalib alsa apm arts avi berkdb bitmap-fonts bluetooth bonobo crypt cups curl dvd dvdr eds emboss encode esd evo fam flac foomaticdb fortran gdbm gif gnome gnutls gphoto2 gpm gstreamer gtk gtk2 gtkhtml gtksharp hal imagemagick imlib ipv6 java jpeg junit kde ldap libg++ libwww mad mikmod mmx mono motif mozilla mp3 mpeg ncurses nls nptl nptlonly ogg oggvorbis opengl oss pam pdflib perl png ppds python qt quicktime radeon readline ruby scanner sdl slang spell sqlite ssl svga tcltk tcpd tetex tiff truetype truetype-fonts type1-fonts usb vorbis xine xml xml2 xmms xv zlib userland_GNU kernel_linux elibc_glibc"
Unset: ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, LINGUAS


(yeah, I know, I shouldn't have started playing with gentopia)
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Spooky Ghost
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Location: Bristol, United Kingdom

PostPosted: Tue May 17, 2005 11:01 am    Post subject: Reply with quote

What does the hosts line in /etc/nsswitch.conf contain? You need at least files and dns.

Code:
hosts:       files dns
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roELEo
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Joined: 28 Sep 2004
Posts: 42
Location: The Netherlands

PostPosted: Tue May 17, 2005 11:03 am    Post subject: Reply with quote

Let's see:

Code:
marvin ~ # cat /etc/nsswitch.conf
# /etc/nsswitch.conf:
# $Header: /home/cvsroot/gentoo-src/rc-scripts/etc/nsswitch.conf,v 1.4 2002/11/18 19:39:22 azarah Exp $

passwd:      compat
shadow:      compat
group:       compat

# passwd:    db files nis
# shadow:    db files nis
# group:     db files nis

hosts:       files dns
networks:    files dns

services:    db files
protocols:   db files
rpc:         db files
ethers:      db files
netmasks:    files
netgroup:    files
bootparams:  files

automount:   files
aliases:     files


Yeah, it's there.
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roELEo
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PostPosted: Tue May 17, 2005 11:26 am    Post subject: Reply with quote

Some more info:

Code:
 marvin ~ # /sbin/ifconfig lo 127.0.0.1 up
SIOCSIFADDR: No such device
lo: unknown interface: No such device
lo: unknown interface: No such device


And:

Code:
marvin ~ # ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:0C:6E:C8:5C:EC 
          inet addr:10.0.0.150  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:37296 errors:0 dropped:0 overruns:0 frame:0
          TX packets:35699 errors:16 dropped:0 overruns:0 carrier:16
          collisions:0 txqueuelen:1000
          RX bytes:34372928 (32.7 Mb)  TX bytes:5947390 (5.6 Mb)
          Interrupt:5 Base address:0x2000

eth1      Link encap:Ethernet  HWaddr 00:26:54:13:0D:54 
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Interrupt:11 Base address:0x9000

eth2      Link encap:UNSPEC  HWaddr 00-E0-18-00-00-37-8D-4A-00-00-00-00-00-00-00-00 
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

sit0      Link encap:IPv6-in-IPv4 
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

usb_kings Link encap:Local Loopback 
          LOOPBACK  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)


Last edited by roELEo on Tue May 17, 2005 11:35 am; edited 1 time in total
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Spooky Ghost
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PostPosted: Tue May 17, 2005 11:29 am    Post subject: Reply with quote

And in /etc/host.conf:
Code:
order hosts, bind


If you are familiar with strace you could also
Code:
strace ping localhost

and make sure there is a line like
Code:
read(4, "# /etc/hosts:  This file describ"..., 4096) = 543

in the output. You might want a comment at the top of /etc/hosts to make it easier to identify.
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roELEo
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PostPosted: Tue May 17, 2005 11:38 am    Post subject: Reply with quote

My /etc/host.conf is:

Code:
# /etc/host.conf:
# $Header: /var/cvsroot/gentoo-x86/sys-libs/glibc/files/2.3.4/host.conf,v 1.2 2$

# The  file /etc/host.conf contains configuration information specific to
# the resolver library.  It should contain one configuration keyword  per
# line,  followed by appropriate configuration information.  The keywords
# recognized are order, trim, mdns, multi, nospoof, spoof, and reorder.



# This keyword specifies how host lookups are to be performed. It
# should be followed by one or more lookup methods, separated by
# commas.  Valid methods are bind, hosts, and nis.
#
order hosts, bind


# Valid values are on and off. If set to on, the resolv+ library treats
# the .local top level domain as link-local domain and sends multicast
# DNS requests to the multicast address 224.0.0.251 port 5353 instead
# of normal DNS requests. If you already use the .local domain in your
# nameserver configuration you will have to switch this option off.
#
mdns off


# Valid  values are on and off.  If set to on, the resolv+ library
# will return all valid addresses for a host that appears  in  the
# /etc/hosts  file,  instead  of  only  the first.  This is off by
# default, as it may cause a substantial performance loss at sites
# with large hosts files.
#
multi off
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roELEo
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PostPosted: Tue May 17, 2005 11:48 am    Post subject: Reply with quote

...and doing a strace ping localhost gives this output:
(which I'm loking over right now)

Code:
execve("/bin/ping", ["ping", "localhost"], [/* 44 vars */]) = 0
uname({sys="Linux", node="marvin", ...}) = 0
brk(0)                                  = 0x8063000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=129241, ...}) = 0
mmap2(NULL, 129241, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7fc9000
close(3)                                = 0
open("/lib/libresolv.so.2", O_RDONLY)   = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300#\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=73408, ...}) = 0
mmap2(NULL, 84180, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb7fb4000
mprotect(0xb7fc4000, 18644, PROT_NONE)  = 0
mmap2(0xb7fc5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10) = 0xb7fc5000
mmap2(0xb7fc7000, 6356, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7fc7000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260P\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1348080, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fb3000
mmap2(NULL, 1260732, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb
7e7f000
mprotect(0xb7fac000, 27836, PROT_NONE)  = 0
mmap2(0xb7fad000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x12d) = 0xb7fad000
mmap2(0xb7fb1000, 7356, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7fb1000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7e7e000
mprotect(0xb7fad000, 4096, PROT_READ)   = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e7e6b0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0xb7fc9000, 129241)              = 0
open("/dev/urandom", O_RDONLY)          = 3
read(3, "\246\305\225\21", 4)           = 4
close(3)                                = 0
socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 3
getuid32()                              = 0
setuid32(0)                             = 0
brk(0)                                  = 0x8063000
brk(0x8084000)                          = 0x8084000
gettimeofday({1116330366, 102843}, NULL) = 0
getpid()                                = 18273
open("/etc/resolv.conf", O_RDONLY)      = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=33, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc9000
read(4, "nameserver 10.0.0.138\nsearch lan"..., 131072) = 33
read(4, "", 131072)                     = 0
close(4)                                = 0
munmap(0xb7fc9000, 131072)              = 0
socket(PF_FILE, SOCK_STREAM, 0)         = 4
fcntl64(4, F_GETFL)                     = 0x2 (flags O_RDWR)
fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK)  = 0
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(4)                                = 0
socket(PF_FILE, SOCK_STREAM, 0)         = 4
fcntl64(4, F_GETFL)                     = 0x2 (flags O_RDWR)
fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK)  = 0
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(4)                                = 0
open("/etc/nsswitch.conf", O_RDONLY)    = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=498, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc9000
read(4, "# /etc/nsswitch.conf:\n# $Header:"..., 131072) = 498
read(4, "", 131072)                     = 0
close(4)                                = 0
munmap(0xb7fc9000, 131072)              = 0
open("/etc/ld.so.cache", O_RDONLY)      = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=129241, ...}) = 0
mmap2(NULL, 129241, PROT_READ, MAP_PRIVATE, 4, 0) = 0xb7fc9000
close(4)                                = 0
open("/lib/libnss_files.so.2", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220\31"..., 512) = 512
fstat64(4, {st_mode=S_IFREG|0755, st_size=39824, ...}) = 0
mmap2(NULL, 41576, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0xb7e73000
mmap2(0xb7e7c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x8) = 0xb7e7c000
close(4)                                = 0
munmap(0xb7fc9000, 129241)              = 0
open("/etc/host.conf", O_RDONLY)        = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=1302, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc9000
read(4, "# /etc/host.conf:\n# $Header: /va"..., 131072) = 1302
read(4, "", 131072)                     = 0
close(4)                                = 0
munmap(0xb7fc9000, 131072)              = 0
open("/etc/hosts", O_RDONLY)            = 4
fcntl64(4, F_GETFD)                     = 0
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
fstat64(4, {st_mode=S_IFREG|0644, st_size=219, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc9000
read(4, "# marvinhosts\n127.0.0.1\tmarvin\tl"..., 131072) = 219
close(4)                                = 0
munmap(0xb7fc9000, 131072)              = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
connect(4, {sa_family=AF_INET, sin_port=htons(1025), sin_addr=inet_addr("127.0.0.1")}, 16) = 0
getsockname(4, {sa_family=AF_INET, sin_port=htons(32946), sin_addr=inet_addr("10.0.0.150")}, [16]) = 0
close(4)                                = 0
setsockopt(3, SOL_RAW, ICMP_FILTER, ~(ICMP_ECHOREPLY|ICMP_DEST_UNREACH|ICMP_SOURCE_QUENCH|ICMP_REDIRECT|ICMP_TIME_EXCEEDED|ICMP_PARAMETERPROB), 4) = 0
setsockopt(3, SOL_IP, IP_RECVERR, [1], 4) = 0
setsockopt(3, SOL_SOCKET, SO_SNDBUF, [324], 4) = 0
setsockopt(3, SOL_SOCKET, SO_RCVBUF, [65536], 4) = 0
getsockopt(3, SOL_SOCKET, SO_RCVBUF, [131072], [4]) = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fe8000
write(1, "PING marvin (127.0.0.1) 56(84) b"..., 46PING marvin (127.0.0.1) 56(84) bytes of data.
) = 46
setsockopt(3, SOL_SOCKET, SO_TIMESTAMP, [1], 4) = 0
setsockopt(3, SOL_SOCKET, SO_SNDTIMEO, "\1\0\0\0\0\0\0\0", 8) = 0
setsockopt(3, SOL_SOCKET, SO_RCVTIMEO, "\1\0\0\0\0\0\0\0", 8) = 0
rt_sigaction(SIGINT, {0x804ba20, [], SA_INTERRUPT}, NULL, 8) = 0
rt_sigaction(SIGALRM, {0x804ba20, [], SA_INTERRUPT}, NULL, 8) = 0
rt_sigaction(SIGQUIT, {0x804ba30, [], SA_INTERRUPT}, NULL, 8) = 0
gettimeofday({1116330366, 148453}, NULL) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TIOCGWINSZ, {ws_row=44, ws_col=80, ws_xpixel=0, ws_ypixel=0}) = 0
gettimeofday({1116330366, 149829}, NULL) = 0
gettimeofday({1116330366, 150252}, NULL) = 0
sendmsg(3, {msg_name(16)={sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.1")}, msg_iov(1)=[{"\10\0\265MaG\0\1~\331\211B\354J\2\0\10\t\n\v\f\r\16\17"..., 64}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, 0xbfffe2e0, 0)               = -1 EAGAIN (Resource temporarily unavailable)
gettimeofday({1116330367, 151917}, NULL) = 0
gettimeofday({1116330367, 152391}, NULL) = 0
sendmsg(3, {msg_name(16)={sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.1")}, msg_iov(1)=[{"\10\0YDaG\0\2\177\331\211BGS\2\0\10\t\n\v\f\r\16\17\20"..., 64}], msg_controllen=0, msg_flags=0}, 0) = 64
recvmsg(3, 0xbfffe2e0, 0)               = -1 EAGAIN (Resource temporarily unavailable)


I cut if off here because it's only repeating the EAGAIN (Resource temporarily unavailable) code snippet.


Last edited by roELEo on Tue May 17, 2005 11:54 am; edited 1 time in total
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roELEo
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PostPosted: Tue May 17, 2005 11:51 am    Post subject: Reply with quote

Spooky Ghost wrote:
and make sure there is a line like
Code:
read(4, "# /etc/hosts:  This file describ"..., 4096) = 543

in the output. You might want a comment at the top of /etc/hosts to make it easier to identify.


The first line of /etc/hosts now reads # marvinhosts, so looking at the strace output I see:

Code:
read(4, "# marvinhosts\n127.0.0.1\tmarvin\tl"..., 131072) = 219
close(4)                                = 0
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Spooky Ghost
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PostPosted: Tue May 17, 2005 1:05 pm    Post subject: Reply with quote

I think you are on a better line with the failure of ifconfig. net.lo in /etc/init.d is the script that should bring the loopback interface up. If you do rc-update show you should see that this is started in the boot level. I don't think it is possible to configure the loopback device as a kernel module so it's unlikely that this is messed up. Do you have anything in the dmesg output which relates to the lo device?

(Actually if I had paid more attention to your first comment, nmap has resolved localhost to the correct address so nsswitch.conf and host.conf weren't going to be the problem.)
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PostPosted: Tue May 17, 2005 1:24 pm    Post subject: Reply with quote

net.lo is definitely started at boot:

Code:
 marvin # rc-update show | grep net.lo
              net.lo | boot   


And dmesg doesn't cough up anything related to net.lo as far as I can see.

Code:
marvin ~ # dmesg | grep net
forcedeth.c: Reverse Engineered nForce ethernet driver. Version 0.31.
3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
eth1394: eth2: IEEE-1394 IPv4 over 1394 Ethernet (fw-host0)
marvin ~ # dmesg | grep NET
NET: Registered protocol family 2
NET: Registered protocol family 1
NET: Registered protocol family 10
NET: Registered protocol family 17
NET: Registered protocol family 31


I'm looking at it some more... ;-)
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PostPosted: Tue May 17, 2005 2:19 pm    Post subject: Reply with quote

For now, I'll start with downgrading from the very unstable udev/hal packages that came with the Gentopia overlay.
That's just too much living on the edge. After that, let's see what is still wrong... :)
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PostPosted: Tue May 17, 2005 9:28 pm    Post subject: Reply with quote

Well, that didn't do it. :(
What I did see is that, on startup, I get an error that /etc/init.d/net.eth1 doesn't exist.

Update: That last 'problem' is now fixed. net.eth1 was still running around in my default runlevels for one reason or another. :)

Regarding lo being unavailable, even a new kernel (2.6.11-r9) doesn't fix it.
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PostPosted: Thu May 19, 2005 11:29 am    Post subject: Reply with quote

Since I have been unable to solve this problem, I opened a bug for it here:
https://bugs.gentoo.org/show_bug.cgi?id=93166
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