晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Directory :  /etc/sysconfig/network-scripts/

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Current File : //etc/sysconfig/network-scripts/ifup-sit
#!/bin/bash
#
# ifup-sit
#
#
# Taken from:
# (P) & (C) 2000-2003 by Peter Bieringer <pb@bieringer.de>
#
#  You will find more information on the initscripts-ipv6 homepage at
#   http://www.deepspace6.net/projects/initscripts-ipv6.html
#
# RHL integration assistance by Pekka Savola <pekkas@netcore.fi>
#
# Version: 2003-09-08
#
# Uses following information from /etc/sysconfig/network:
#  IPV6_DEFAULTDEV=<device>: controls default route (optional)
#  IPV6_DEFAULTGW=<address>: controls default route (optional)
#
# Uses following information from /etc/sysconfig/network-scripts/ifcfg-$1:
#  DEVICE=<device>
#  IPV6INIT=yes|no: controls IPv6 configuration for this interface
#  IPV6_MTU=<MTU for IPv6>: controls IPv6 MTU for this link (optional)
#
#  For static tunnels
#  IPV6TUNNELIPV4=<IPv4 address>: IPv4 address of remote tunnel endpoint
#  IPV6TUNNELIPV4LOCAL=<IPv4 address>: (optional) local IPv4 address of tunnel
#  IPV6ADDR=<IPv6 address>[/<prefix length>]: (optional) local IPv6 address of a numbered tunnel
#  IPV6ADDR_SECONDARIES="<IPv6 address>[/<prefix length>] ..." (optional) additional local IPv6 addresses
#


. /etc/sysconfig/network

cd /etc/sysconfig/network-scripts
. ./network-functions

CONFIG=$1
[ -f "$CONFIG" ] || CONFIG=ifcfg-$CONFIG
source_config

# IPv6 don't need aliases anymore, config is skipped
REALDEVICE=${DEVICE%%:*}
[ "$DEVICE" != "$REALDEVICE" ] && exit 0

# Test whether IPv6 configuration is disabled for this interface
is_false "$IPV6INIT" && exit 0

[ -f /etc/sysconfig/network-scripts/network-functions-ipv6 ] || exit 1
. /etc/sysconfig/network-scripts/network-functions-ipv6


# IPv6 test, module loaded, exit if system is not IPv6-ready
ipv6_test || exit 1

# Generic tunnel device sit0 is not supported here
if [ "$DEVICE" = "sit0" ]; then
    net_log $"Device '$DEVICE' isn't supported here, use IPV6_AUTOTUNNEL setting and restart (IPv6) networking"
    exit 1
fi

if [ -z "$IPV6TUNNELIPV4" ]; then
    net_log $"Missing remote IPv4 address of tunnel, configuration is not valid"
    exit 1
fi

# Test device status
ipv6_test_device_status $DEVICE
if [ $? = 0 ]; then
    # device is already up
    net_log $"Device '$DEVICE' is already up, please shutdown first"
    exit 1
fi

# Create tunnel
ipv6_add_tunnel_device $DEVICE $IPV6TUNNELIPV4 "" $IPV6TUNNELIPV4LOCAL || exit 1

# Set IPv6 MTU, if given
if [ -n "$IPV6_MTU" ]; then
    ipv6_set_mtu $DEVICE $IPV6_MTU
fi

# Apply local IPv6 address, if given (numbered tunnel)
if [ -n "$IPV6ADDR" ]; then
    ipv6_add_addr_on_device $DEVICE $IPV6ADDR
fi

# Setup additional IPv6 addresses from list, if given
if [ -n "$IPV6ADDR_SECONDARIES" ]; then
    for ipv6addr in $IPV6ADDR_SECONDARIES; do
        ipv6_add_addr_on_device $DEVICE $ipv6addr
    done
fi

# Setup default IPv6 route, check are done by function
if [ -n "$IPV6_DEFAULTDEV" -o -n "$IPV6_DEFAULTGW" ]; then
    ipv6_set_default_route "$IPV6_DEFAULTGW" "$IPV6_DEFAULTDEV" "$DEVICE"
fi

# Setup additional static IPv6 routes on specified interface, if given
if [ -f /etc/sysconfig/static-routes-ipv6 ]; then
    LC_ALL=C grep -w "^$DEVICE" /etc/sysconfig/static-routes-ipv6 | while read device ipv6route args; do
    ipv6_add_route $ipv6route :: $DEVICE
done
fi

# Setup static routes
/etc/sysconfig/network-scripts/ifup-routes ${REALDEVICE}

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