Date: Sat, 08 Nov 2014 22:24:34 +0100 From: "Michael Ross" <gmx@ross.cx> To: "Freebsd Questions" <questions@freebsd.org>, "Gary Aitken" <vagabond@blackfoot.net> Subject: Re: ARP only, no ICMP packets? Message-ID: <op.xo0y28eig7njmm@michael-think.fritz.box> In-Reply-To: <8c6d3f5dbb1ebe2feac628f7ca52eb22.squirrel@webmail.blackfoot.net> References: <8c6d3f5dbb1ebe2feac628f7ca52eb22.squirrel@webmail.blackfoot.net>
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On Sat, 08 Nov 2014 21:33:44 +0100, Gary Aitken <vagabond@blackfoot.net> wrote: > After reconfiguring my internal network to private ip addrs, > I'm trying to reconfigure a DLink wireless access point. > At first I tried using the old IP addrs and configuring my > workstation with an alias on the old network. That didn't > work, so I've reset the wap. The manual says default addr is > 192.168.0.50 netmask 255.255.255.0 > > The box I'm trying to access it from has an ip of 192.168.151.122/24. > I've added an alias to the interface for the 192.168.0 subnet: > > Routing tables > > Internet: > Destination Gateway Flags Refs Use Netif > Expire > default 192.168.151.101 UGS 0 0 re0 > 127.0.0.1 link#10 UH 0 59752 lo0 > 192.168.0.0/24 link#1 U 0 121 re0 > 192.168.0.122 link#1 UHS 0 0 lo0 > 192.168.151.0/24 link#1 U 0 54 re0 > 192.168.151.122 link#1 UHS 0 0 lo0 > > When I attempt to access the WAP, I see only ARP requests, > and it appears not to answer: > > $ arp -n -a > ? (192.168.151.122) at f4:6d:04:78:70:62 on re0 permanent [ethernet] > ? (192.168.0.122) at f4:6d:04:78:70:62 on re0 permanent [ethernet] > ? (192.168.151.101) at 00:01:02:c2:a1:a8 on re0 expires in 339 seconds > [ethernet] > > # tcpdump -flnt -i re0 | grep 192.168.0.50 > tcpdump: verbose output suppressed, use -v or -vv for full protocol > decode > listening on re0, link-type EN10MB (Ethernet), capture size 65535 bytes > ARP, Request who-has 192.168.0.50 tell 192.168.0.122, length 28 No ARP reply... > I have difficulty believing the wap unit is defective, as "it worked > before I changed all the addresses..." Maybe not defective as such, but some DLinks ( mine for example ) ignore everything not originating from their own /24, so unless packets come from 192.168.0.x, they will be silently discarded. Michael
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