Date: Tue, 12 Nov 2024 08:34:53 -0800 From: Gary Aitken <freebsd@dreamchaser.org> To: questions@freebsd.org Subject: Re: missing ARP reply Message-ID: <76101826-4507-4db4-b7dc-4abb90641713@dreamchaser.org> In-Reply-To: <0f00ea1a-8b62-4c0d-80ee-08721794483b@dreamchaser.org> References: <0f00ea1a-8b62-4c0d-80ee-08721794483b@dreamchaser.org>
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On 11/11/24 21:36, Gary Aitken wrote: > I'm having trouble with my solar inverter connecting to its home > base somewhere in Germany and am suspecting a problem with a missing > ARP reply. ... > xxx.yyy is the inverter on the local network xxx.zzz is the fbsd > gateway/router on the local network > > #tcpdump -flnt -i fxp0 | grep 192.168.xxx.yyy ARP, Request who-has > 192.168.xxx.zzz (aa:bb:cc:dd:ee:ff) tell 192.168.xxx.yyy, length 46 > IP 192.168.xxx.yyy.3337 > 147.185.237.1.22222: Flags [.], seq > 26043:26065, ack 708198036, win 2144, length 22 IP > 147.185.237.1.22222 > 192.168.xxx.yyy.3337: Flags [P.], seq 1:23, ack > 22, win 18410, length 22 IP 192.168.xxx.yyy.3337 > > 147.185.237.1.22222: Flags [.], ack 23, win 2144, length 0 > > I'm guessing the 3 packets exchanged are a power optimizer reporting > in, but may be the inverter doing something. > > The arp table on xxx.zzz has a permanent entry for itself on the > interface, picked up from /etc/hosts: > > # arp -a ns.dreamchaser.org (192.168.xxx.zzz) at aa:bb:cc:dd:ee:ff on > fxp0 permanent [ethernet] > > Thoughts on why I am not seeing a reply to the ARP request? My error; tcpdump does not print the destination host address in the ARP reply, so grep didn't catch it. duh. Should have been tcpdump -flnt -i fxp0 | grep ARP or tcpdump -flnt -i fxp0 | grep aa:bb:cc:dd:ee:ff Gary
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