--- nono/host/netdriver_bpf.cpp	2026/04/29 17:05:47	1.1.1.8
+++ nono/host/netdriver_bpf.cpp	2026/04/29 17:06:02	1.1.1.9
@@ -168,7 +168,7 @@ NetDriverBPF::Close()
 
 // モニタ (ドライバ依存情報のみ)
 void
-NetDriverBPF::MonitorUpdateMD(TextScreen& screen, int y)
+NetDriverBPF::MonitorScreenMD(TextScreen& screen, int y)
 {
 	screen.Print(0, y++, "Device   : %s", devpath.c_str());
 	screen.Print(0, y++, "Interface: %s", ifname.c_str());
@@ -182,11 +182,11 @@ NetDriverBPF::Write(const void *buf, int
 
 	n = write(fd, buf, buflen);
 	if (n < 0) {
-		putmsg(0, "write: %s", strerror(errno));
+		putmsg(0, "write(%d): %s", buflen, strerror(errno));
 		return;
 	}
 	if (n < buflen) {
-		putmsg(0, "write: short");
+		putmsg(0, "write(%d): short(%zd)", buflen, n);
 		return;
 	}
 }
@@ -209,10 +209,7 @@ NetDriverBPF::Read(NetPacket *p)
 
 	// BPF ヘッダを除いた部分が 1 パケット
 	struct bpf_hdr *bh = (struct bpf_hdr *)bpfptr;
-
-	NetPacket& packet = *p;
-	memcpy(packet.data(), bpfptr + bh->bh_hdrlen, bh->bh_caplen);
-	packet.length = bh->bh_caplen;
+	p->Assign(bpfptr + bh->bh_hdrlen, bh->bh_caplen);
 
 	// 次のフレームの先頭を指す
 	int framelen = BPF_WORDALIGN(bh->bh_hdrlen + bh->bh_caplen);