Networked Macs Not Always Showing Up In Network In Finder - On One Mac

The problem is that awake and running networked macs do not always show up in Network on the Finder. Sometimes they do and sometimes they do not. The problem happens fequently on one machine. Very similar questions have been posted on this. I suspect many are dancing around the same issue. I am hoping to get to the bottom of this.
All the OS X machines are running 10.4.9. Two are networked by Airport. The Airport and the problem iMac, an older G3, are wired to a LAN. On the LAN sits a PPC 7200 running OS9 IpNetRouter serving up IP addresses for all the connected devices, including printers. IpNetRouter also provides an internet connection out through a second ethernet card. The PPC 7200 drive is always reliably available for connecting to in the Finder.
Each of the OS X machines are set for Personal File Sharing only, with Firewall running, and without Stealth Mode enabled.
The problem is noticed on the wired Mac. Perhaps that is the key to this. The problem is not two way. The Finder on the wireless Macs shows the wired Mac in Network when the wired Mac is not showing the wireless Mac. Sometimes only one of the wireless Macs shows on the wired Mac. When that happens it is always the wireless eMac instead of the wireless Intel Mac.
When this problem occurs, it is always possible to connect to the "missing" wireless Macs by using their local IP address reported by IpNetRouter. It is not possible to do the same using the computer name of the Mac that should be visible in Network or by using its DHCP client ID.

No Macs are sleeping, but they might have been in the past. They don't show up when they are sleeping. These machines are often on for days. All are updated on a regular basis, including in the past two days.

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