ARP only, no ICMP packets?
gmx at ross.cx
Sat Nov 8 21:24:54 UTC 2014
On Sat, 08 Nov 2014 21:33:44 +0100, Gary Aitken <vagabond at blackfoot.net>
> 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
> Destination Gateway Flags Refs Use Netif
> 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
> # tcpdump -flnt -i re0 | grep 192.168.0.50
> tcpdump: verbose output suppressed, use -v or -vv for full protocol
> 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.
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