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为什么 ping 没有得到回复？

tag-icon • tag-icon dhcp ping tcp
为什么 ping 没有得到回复？

我有一块带有 CFE（最小加载程序）的嵌入式主板。我有一台主机 - Linux FC16，我在其中运行 dhcpd 服务器。我的接口是 p3p1。以下是 ifcfg-p3p1 的详细信息。

HWADDR=14:D6:4D:1F:F3:F8
BOOTPROTO=none
ONBOOT=yes
NM_CONTROLLED=no
TYPE=Ethernet
USERCTL=no
IPV6INIT=no
IPADDR=10.240.100.100
NETMASK=255.255.255.0
NETWORK=10.240.100.0
GATEWAY=10.240.100.1
PREFIX=24

现在，我有以下 dhcpd.conf 文件 -

default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;

ddns-update-style interim;
allow booting; 
allow bootp;
ignore client-updates;
set vendorclass = option vendor-class-identifier;

subnet 10.240.100.0 netmask 255.255.255.0 {
    option routers 10.240.100.1;
    option subnet-mask      255.255.255.0;
    range  10.240.100.100 10.240.100.254;
    default-lease-time  21600;
    max-lease-time  43200;
    next-server 10.240.100.1;
}

客户端没有获取 IP 地址，因此我首先尝试解决连接问题。

我为我的客户端分配了一个 IP 地址 -

setenv -p IPADDRESS 10.240.100.200 NETMASK 255.255.255.0 gw 10.240.100.1

现在，当我尝试从客户端 ping 我的主机时，我看到以下内容。

在客户端 -

CFE> ping 10.240.100.100
10.240.100.100 (10.240.100.100) is not responding (seq=0)
10.240.100.100 (10.240.100.100): 1 packets sent, 0 received
*** command status = 1

在主机端 -

# tcpdump -e -i p3p1 -vvv 
tcpdump: listening on p3p1, link-type EN10MB (Ethernet), capture size 65535 bytes
16:20:23.885757 e0:b7:b1:23:60:d0 (oui Unknown) > 14:d6:4d:1f:f3:f8 (oui Unknown), ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 100, id 33, offset 0, flags [none], proto ICMP (1), length 84)
    0.0.0.0 > 10.240.100.100: ICMP echo request, id 988, seq 0, length 64

我看到这里的 mac 地址是正确的。客户端 MAC 地址是 e0:b7:b1:23:60:d0 主机 mac 地址是以下 14:d6:4d:1f:f3:f8。

这里可能存在什么问题？由于我是网络新手，请给我一些指点。

# ifconfig
em1       Link encap:Ethernet  HWaddr B8:CA:3A:89:EE:F1  
          inet addr:136.170.195.17  Bcast:136.170.195.255  Mask:255.255.252.0
          inet6 addr: fe80::baca:3aff:fe89:eef1/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4362507 errors:0 dropped:2 overruns:0 frame:0
          TX packets:1467982 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:5484308631 (5.1 GiB)  TX bytes:115472934 (110.1 MiB)
          Interrupt:20 Memory:f7e00000-f7e20000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:32118 errors:0 dropped:0 overruns:0 frame:0
          TX packets:32118 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:6121874 (5.8 MiB)  TX bytes:6121874 (5.8 MiB)

p3p1      Link encap:Ethernet  HWaddr 14:D6:4D:1F:F3:F8  
          inet addr:10.240.100.100  Bcast:10.240.100.255  Mask:255.255.255.0
          inet6 addr: fe80::16d6:4dff:fe1f:f3f8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:209 errors:0 dropped:0 overruns:0 frame:0
          TX packets:411 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:49526 (48.3 KiB)  TX bytes:60967 (59.5 KiB)

我仅在接口 p3p1 上运行 dhcpd。

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