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Date:      Sat, 8 Nov 2014 19:41:23 -0700
From:      "Gary Aitken" <vagabond@blackfoot.net>
To:        "Freebsd Questions" <questions@freebsd.org>, "Freebsd Questions" <questions@freebsd.org>
Cc:        gmx@ross.cx, jon@radel.com
Subject:   Re: ARP only, no ICMP packets?
Message-ID:  <b62bfb80fceac3f7a4748f15825edf67.squirrel@webmail.blackfoot.net>

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On 11/08/14 14:24, Michael Ross wrote:
> 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.

In this case, they are originating from 192.168.0.122, so should be ok there.
(see ARP request above)

On 11/08/14 16:34, Jon Radel wrote:

> Have you swept the /24 on the off chance that the manual is fibbing about
> 192.168.0.50 but not about it being some address in 192.168.0.0/24?  If
> that fails, try 192.168.1.0/24.  Other addresses D-Link seems to favor as
> the default:
> 192.168.0.1
> 192.168.0.30
> 192.168.1.1

Thanks.
Yes, I swept all of 192.168.0.* and .1.*
nada.









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