Thanks a lot for your response. On Fri, 2005-06-24 at 18:41 +0200, Jeroen Massar wrote: > On Fri, 2005-06-24 at 12:24 -0400, Ming Zhang wrote: > > Hi folks, > > > > I met a strange arp output I can not explain. > > "man arp" will help you here. > > > It is a dual port box with linux 2.4.27 kernel. I do not know where this > > intenal.RFC1918 come from. and why there are 2 line with same mac. > > The names are coming from reverse DNS or /etc/hosts, use "arp -n" to > avoid that. my only line in /etc/hosts is 127.0.0.1 localhost > > The double mac just could be because 1 MAC has 2 IP's. > any reason my 1MAC has 2IP? i noticed that this duplicated 00:11:2F:5A:24:7A is a mac from another PC(call PC-B). which is not directly connected to the switch. the dual port box (PC-A) connect to gigabit switch A and then connect to a home broadband router B and then my PC-B. The reason i think it is strange because my network performacne drop dramatically. in nornmal situation, only 1 port is used and thus 1 port blink, then suddenly perfromance drop and i saw both 2 ports blink. but if i simply ran command arp and then it jumps back. so i suspect this is the reason. Regards. Ming > Greets, > Jeroen >
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