ARP only, no ICMP packets?

[Michael Ross]

On Sat, 08 Nov 2014 21:33:44 +0100, Gary Aitken <vagabond at 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