私はBroadcom BCM5708ネットワークカードを搭載したHP G5サーバーでテストするためにDebianをインストールしました。
Nmapスキャンは、他のネットワークカードを使用している他のHP G5サーバーで実行するよりも約10倍遅いです。
別のHP G5サーバーBCM5708ネットワークカードでnmapを試してみましたが、非常に遅かったです。
nmap パラメータ:
nmap -T4 10.x.x.x -sV -p0-65535 -v -d
nmap は次の出力を表示します。
SYN Stealth Scan Timing: About 7.11% done; ETC: 21:04 (0:06:45 remaining)
Increased max_successful_tryno for 10.x.x.x to 1 (packet drop)
ネットワークケーブルを交換して別のネットワークポートを試しました（hp g5サーバーには2つのbroadcomネットワークカードがあります）。
何が問題なのでしょうか？
設定されている場合：
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.x.x.x netmask 255.255.0.0 broadcast 10.x.x.255
inet6 fe80::221:5aff:fe4d:a928 prefixlen 64 scopeid 0x20<link>
ether 00:21:5a:4d:a9:28 txqueuelen 1000 (Ethernet)
RX packets 2687021 bytes 177126339 (168.9 MiB)
RX errors 0 dropped 260 overruns 0 frame 0
TX packets 2025533 bytes 132044871 (125.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
情報：
[ 1.392522] bnx2: QLogic bnx2 Gigabit Ethernet Driver v2.2.6 (January 29, 2014)
[ 1.872495] bnx2 0000:03:00.0 eth0: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz found at mem f8000000, IRQ 18, node addr 00:21:5a:4d:a9:28
[ 2.352441] bnx2 0000:05:00.0 eth1: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz found at mem fa000000, IRQ 19, node addr 00:21:5a:4d:a9:2a
[ 2.354702] bnx2 0000:03:00.0 enp3s0: renamed from eth0
[ 2.364238] bnx2 0000:05:00.0 enp5s0: renamed from eth1
[ 7.878464] bnx2 0000:03:00.0: firmware: direct-loading firmware bnx2/bnx2-mips-06-6.2.3.fw
[ 7.883425] bnx2 0000:03:00.0: firmware: direct-loading firmware bnx2/bnx2-rv2p-06-6.0.15.fw
[ 8.012017] bnx2 0000:03:00.0 enp3s0: using MSI
[ 11.210980] bnx2 0000:03:00.0 enp3s0: NIC Copper Link is Up, 1000 Mbps full duplex
ネットワークツール：
Settings for enp3s0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: off
Supports Wake-on: g
Wake-on: g
Link detected: yes
The test result is PASS
The test extra info:
register_test (offline) 0
memory_test (offline) 0
loopback_test (offline) 0
nvram_test (online) 0
interrupt_test (online) 0
link_test (online) 0
Pause parameters for enp3s0:
Autonegotiate: off
RX: off
TX: off
NIC statistics:
rx_bytes: 195197
rx_error_bytes: 0
tx_bytes: 20772
tx_error_bytes: 0
rx_ucast_packets: 201
rx_mcast_packets: 0
rx_bcast_packets: 2563
tx_ucast_packets: 139
tx_mcast_packets: 0
tx_bcast_packets: 0
tx_mac_errors: 0
tx_carrier_errors: 0
rx_crc_errors: 0
rx_align_errors: 0
tx_single_collisions: 0
tx_multi_collisions: 0
tx_deferred: 0
tx_excess_collisions: 0
tx_late_collisions: 0
tx_total_collisions: 0
rx_fragments: 0
rx_jabbers: 0
rx_undersize_packets: 0
rx_oversize_packets: 0
rx_64_byte_packets: 2440
rx_65_to_127_byte_packets: 285
rx_128_to_255_byte_packets: 28
rx_256_to_511_byte_packets: 11
rx_512_to_1023_byte_packets: 0
rx_1024_to_1522_byte_packets: 0
rx_1523_to_9022_byte_packets: 0
tx_64_byte_packets: 1
tx_65_to_127_byte_packets: 83
tx_128_to_255_byte_packets: 47
tx_256_to_511_byte_packets: 8
tx_512_to_1023_byte_packets: 0
tx_1024_to_1522_byte_packets: 0
tx_1523_to_9022_byte_packets: 0
rx_xon_frames: 0
rx_xoff_frames: 0
tx_xon_frames: 0
tx_xoff_frames: 0
rx_mac_ctrl_frames: 0
rx_filtered_packets: 123942
rx_ftq_discards: 0
rx_discards: 0
rx_fw_discards: 0
ネットワーク統計 - i
Kernel Interface table
Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
enp3s0 1500 3421 0 245 0 160 0 0 0 BMRU
lo 65536 0 0 0 0 0 0 0 0 LRU