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本帖最后由 asuka2001 于 2013-11-25 18:13 编辑
在某台虚拟机中:
# arping -I eth1 192.168.240.6
ARPING 192.168.240.6 from 192.168.240.8 eth1
Sent 6 probes (6 broadcast(s))
Received 0 response(s)
但是tcpdump可以发现有收到报文
# tcpdump -nexx -c 10 -i eth1 arp
01:14:39.251204 fa:16:3e:1e:6b:40 > Broadcast, ethertype ARP (0x0806), length 42: arp who-has 192.168.240.6 (Broadcast) tell 192.168.240.8
0x0000: ffff ffff ffff fa16 3e1e 6b40 0806 0001
0x0010: 0800 0604 0001 fa16 3e1e 6b40 c0a8 f008
0x0020: ffff ffff ffff c0a8 f006
01:14:39.251576 fa:16:3e:6e:02:4e > fa:16:3e:1e:6b:40, ethertype ARP (0x0806), length 56: arp reply 192.168.240.6 is-at fa:16:3e:6e:02:4e
0x0000: fa16 3e1e 6b40 fa16 3e6e 024e 0806 0001
0x0010: 0800 0604 0002 fa16 3e6e 024e c0a8 f006
0x0020: fa16 3e1e 6b40 c0a8 f008 0000 0000 0000
0x0030: 0000 0000 0000 0000
完全搞不明白了,是因为防火墙的原因把arp reply报文给扔了吗?对这个不熟悉,请熟悉的人帮忙看看,谢谢。以下是一些详细信息!
# ip neigh show
??? dev eth0 lladdr 74:25:8a:e7:de:e0 REACHABLE
??? dev eth1 lladdr fa:16:3e:ce:24:4d REACHABLE
??? dev eth0 lladdr fa:16:3e:39:8c:ca REACHABLE
127.1.1.2 dev tmm0 lladdr 00:01:23:45:67:00 DELAY
192.168.239.2 dev eth0 lladdr fa:16:3e:39:8c:ca REACHABLE
192.168.239.1 dev eth0 lladdr 74:25:8a:e7:de:e0 STALE
192.168.240.2 dev eth1 FAILED
# ifconfig eth1
eth1 Link encap:Ethernet HWaddr FA:16:3E:1E:6B:40
inet addr:192.168.240.8 Bcast:192.168.240.255 Mask:255.255.255.0
inet6 addr: fe80::f816:3eff:fe1e:6b40/64 Scope:Link
UP BROADCAST RUNNING PROMISC ALLMULTI MULTICAST MTU:9000 Metric:1
RX packets:287945 errors:0 dropped:0 overruns:0 frame:0
TX packets:57070 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17196973 (16.4 MiB) TX bytes:3449556 (3.2 MiB)
# iptables -L -n
Chain INPUT (policy ACCEPT)
target prot opt source destination
icsa all -- 0.0.0.0/0 0.0.0.0/0
ACCEPT all -- 127.2.0.1 127.2.0.2
ACCEPT all -- 127.2.0.2 127.2.0.2
DROP all -- 0.0.0.0/0 127.2.0.2
ACCEPT tcp -- 127.0.0.1 0.0.0.0/0 tcp dpt:3306
ACCEPT tcp -- 127.3.0.0/24 0.0.0.0/0 tcp dpt:3306
REJECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:3306 reject-with icmp-port-unreachable
ACCEPT tcp -- 127.0.0.1 0.0.0.0/0 tcp dpts:1097:1099
REJECT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:1097:1099 reject-with icmp-port-unreachable
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain hnet (0 references)
target prot opt source destination
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
DROP all -- 0.0.0.0/0 0.0.0.0/0
Chain icsa (1 references)
target prot opt source destination |
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