NEC IX2015設定要点と設定サンプル

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主要コマンドのメモ

時間の設定

Router(config)# timezone 9 
Router(config)# ntp retry 3 
Router(config)# ntp interval 3600 
Router(config)# clock 16 01 0 3 1 2010 
Router(config)# show clock 
Sunday, 3 January 2010 16:01:28 +09 00

ホスト名の設定(任意）

Router(config)# hostname cu 
cu(config)#

保存

Router(config)# write memory 
Building configuration… 
% Warning: do NOT enter CNTL/Z while saving to avoid config corruption. 
Router(config)#

インターフェイス状態の確認

Router(config)# show interfaces FastEthernet0/0.0 
Interface FastEthernet0/0.0 is administratively down 
  Fundamental MTU is 1500 octets 
  Current bandwidth 100M b/s, QoS is disabled 
  Datalink header cache type is none: 0/0 (standby/dynamic) 
  SNMP MIB-2: 
    ifIndex is 518 
  Logical INTERFACE: 
    Elapsed time after clear counters 0:11:00 
    0 packets input, 0 bytes, 0 errors 
      0 unicasts, 0 non-unicasts, 1 unknown protos 
      0 drops, 0 misc errors 
    0 output requests, 0 bytes, 0 errors 
      0 unicasts, 0 non-unicasts 
      0 overflows, 0 neighbor unreachable, 0 misc errors 
    1 link-up detected, 0 link-down detected 
  Encapsulation ETHERNET: 
    State is initialized 
  FastEthernet status: 
    Physical address is 00:30:13:36:ce:03 
    Port status is up 
    Full-duplex, 100M b/s, 100BaseTX 
    Promiscuous mode is disabled 
    Statistics: 
      Rx errors: 
        0 alignment errors, 0 CRC errors 
        0 long frames, 0 short frames, 0 overflows 
      Tx errors: 
        0 single collisions, 0 multiple collisions 
        0 excessive collisions, 0 late collisions 
        0 deferred transmissions, 0 carrier sense errors 
        0 underflows 
Router(config)#

FE0/0に固定IP設定

Router(config)# interface FastEthernet0/0.0 
Router(config-FastEthernet0/0.0)# ip address 192.168.0.1/24 
Router(config-FastEthernet0/0.0)# ipv6 address autoconfig 
Router(config-FastEthernet0/0.0)# no shutdown 
Router(config-FastEthernet0/0.0)# show ip address</p> 
<p><strong>FE0/1にDHCP設定</strong> 
Router(config)# interface FastEthernet0/1.0 
Router(config-FastEthernet0/1.0)# ip address dhcp 
Router(config-FastEthernet0/1.0)# ipv6 address autoconfig 
Router(config-FastEthernet0/1.0)# no shutdown 
Router(config-FastEthernet0/1.0)# show ip address 
Router(config-FastEthernet0/1.0)# ip nat enable

NAT設定

Router(config)# interface FastEthernet0/1.0 
Router(config-FastEthernet0/1.0)# ip nat translation timeout 3600 
Router(config-FastEthernet0/1.0)# ip nat dynamic list lan pool abc 
Router(config-FastEthernet0/1.0)# ip nat enable

telnetサーバ

Router(config)# ip access-list lan permit ip src 192.168.0.0/24 dest any 
Router(config)# telnet-server ip access-list lan 
Router(config)# telnet-server ip enable

default route設定

Router(config)# ip route default FastEthernet0/1.0 dhcp

NTPサーバ設定

Router(config)# ntp server 133.27.4.121 
Router(config)# ntp server 210.173.160.27 
Router(config)# ntp ip enable

DHCPサーバ設定

Router(config)# ip dhcp profile lan 
Router(config-dhcp-lan)# assignable-range 192.168.0.100 192.168.0.254 
Router(config-dhcp-lan)# subnet-mask 255.255.255.0 
Router(config-dhcp-lan)# dns-server 192.168.0.1 
Router(config-dhcp-lan)# exit 
Router(config)# ip dhcp enable 
Router(config)# interface FastEthernet0/0.0 
Router(config-FastEthernet0/0.0)# ip dhcp binding lan 
Router(config-FastEthernet0/0.0)# exit

DNS proxy設定

Router(config)# dns cache enable 
Router(config)# proxy-dns ip enable 
Router(config)# proxy-dns ipv6 enable

UFSキャッシュ有効化

UFS キャッシュ（Unified Forwarding Service Cache）は、フィルタ、NAT/NAPT、IPSec など
のサービスを使用している場合に有効な高速フォワーディングキャッシュメカニズムであり、
IX1000/2000/3000 の独自機能です。UFS キャッシュにより、フィルタの多段設定、IPSec の複
数設定等におけるスケーラビリティを向上させます。Ver4.2 以降の IPv4、IPv6 それぞれで設定
できます。Ver.4.3 以降ではポリシールーティングが、Ver.7.3以降では、QoS、ダイナミックフィ
ルタでも UFS キャッシュが適用されます。

Router(config)# ip ufs-cache enable
j

Filtering設定

ip access-list strict-block deny tcp src any sport any dest any dport eq 137 
ip access-list strict-block deny udp src any sport any dest any dport eq 137 
ip access-list strict-block deny udp src any sport any dest any dport eq 138 
ip access-list strict-block deny tcp src any sport any dest any dport eq 139 
ip access-list strict-block deny tcp src any sport any dest any dport eq 445 
ip access-list strict-block deny udp src any sport any dest any dport eq 445
ip access-list weak-block deny tcp src any sport any dest any dport eq 1 
ip access-list weak-block deny udp src any sport any dest any dport eq 1 
ip access-list weak-block deny tcp src any sport any dest any dport eq 11 
ip access-list weak-block deny udp src any sport any dest any dport eq 11 
ip access-list weak-block deny tcp src any sport any dest any dport eq 15 
ip access-list weak-block deny udp src any sport any dest any dport eq 15 
ip access-list weak-block deny tcp src any sport any dest any dport eq 70 
ip access-list weak-block deny udp src any sport any dest any dport eq 70 
ip access-list weak-block deny tcp src any sport any dest any dport eq 79 
ip access-list weak-block deny udp src any sport any dest any dport eq 79 
ip access-list weak-block deny tcp src any sport any dest any dport eq 87 
ip access-list weak-block deny udp src any sport any dest any dport eq 87 
ip access-list weak-block deny tcp src any sport any dest any dport eq 95 
ip access-list weak-block deny udp src any sport any dest any dport eq 95 
ip access-list weak-block deny tcp src any sport any dest any dport eq 111 
ip access-list weak-block deny udp src any sport any dest any dport eq 111 
ip access-list weak-block deny tcp src any sport any dest any dport eq 135 
ip access-list weak-block deny udp src any sport any dest any dport eq 135 
ip access-list weak-block deny tcp src any sport any dest any dport eq 144 
ip access-list weak-block deny udp src any sport any dest any dport eq 144 
ip access-list weak-block deny tcp src any sport any dest any dport eq 161 
ip access-list weak-block deny udp src any sport any dest any dport eq 161 
ip access-list weak-block deny tcp src any sport any dest any dport eq 162 
ip access-list weak-block deny udp src any sport any dest any dport eq 162 
ip access-list weak-block deny tcp src any sport any dest any dport eq 177 
ip access-list weak-block deny udp src any sport any dest any dport eq 177 
ip access-list weak-block deny tcp src any sport any dest any dport eq 220 
ip access-list weak-block deny udp src any sport any dest any dport eq 220 
ip access-list weak-block deny tcp src any sport any dest any dport eq 445 
ip access-list weak-block deny udp src any sport any dest any dport eq 445 
ip access-list weak-block deny tcp src any sport any dest any dport eq 512 
ip access-list weak-block deny udp src any sport any dest any dport eq 512 
ip access-list weak-block deny tcp src any sport any dest any dport eq 513 
ip access-list weak-block deny udp src any sport any dest any dport eq 513 
ip access-list weak-block deny tcp src any sport any dest any dport eq 514 
ip access-list weak-block deny udp src any sport any dest any dport eq 514 
ip access-list weak-block deny tcp src any sport any dest any dport eq 515 
ip access-list weak-block deny udp src any sport any dest any dport eq 515 
ip access-list weak-block deny tcp src any sport any dest any dport eq 517 
ip access-list weak-block deny udp src any sport any dest any dport eq 517 
ip access-list weak-block deny tcp src any sport any dest any dport eq 518 
ip access-list weak-block deny udp src any sport any dest any dport eq 518 
ip access-list weak-block deny tcp src any sport any dest any dport eq 520 
ip access-list weak-block deny udp src any sport any dest any dport eq 520 
ip access-list weak-block deny tcp src any sport any dest any dport eq 540 
ip access-list weak-block deny udp src any sport any dest any dport eq 540 
ip access-list weak-block deny tcp src any sport any dest any dport eq 1025 
ip access-list weak-block deny udp src any sport any dest any dport eq 1025 
ip access-list weak-block deny tcp src any sport any dest any dport eq 2000 
ip access-list weak-block deny udp src any sport any dest any dport eq 2000 
ip access-list weak-block deny tcp src any sport any dest any dport eq 2049 
ip access-list weak-block deny udp src any sport any dest any dport eq 2049 
ip access-list weak-block deny tcp src any sport any dest any dport eq 2766 
ip access-list weak-block deny udp src any sport any dest any dport eq 2766 
ip access-list weak-block deny tcp src any sport any dest any dport range 6000 6063 
ip access-list weak-block deny udp src any sport any dest any dport range 6000 6063 
ip access-list weak-block deny tcp src any sport any dest any dport eq 12345 
ip access-list weak-block deny udp src any sport any dest any dport eq 12345
ip access-list specialuse deny ip src 0.0.0.0/8 dest any 
ip access-list specialuse deny ip src 10.0.0.0/8 dest any 
ip access-list specialuse deny ip src 172.16.0.0/12 dest any 
ip access-list specialuse deny ip src 192.168.0.0/16 dest any 
ip access-list specialuse deny ip src 127.0.0.0/8 dest any 
ip access-list specialuse deny ip src 169.254.0.0/16 dest any 
ip access-list specialuse deny ip src 192.0.2.0/24 dest any 
ip access-list specialuse deny ip src 224.0.0.0/3 dest any 
ip access-list specialuse deny ip src 198.18.0.0/15 dest any 
ip access-list mynetwork permit ip src 192.168.0.0/24 dest any 
ip access-list all-pass permit ip src any dest any 
ip filter forced-reassembly
interface  FastEthernet0/1.0 
ip filter all-pass 65000 in 
ip filter all-pass 65000 out 
ip filter mynetwork 50 out 
ip filter strict-block 1 in 
ip filter strict-block 1 out 
ip filter weak-block 100 in 
ip filter weak-block 100 out 
ip filter specialuse 101 in 
ip filter specialuse 101 out

再起動

# スタートアップコンフィグのロード、DRAMメモリのクリア 
restart
# プログラムのロード、スタートアップコンフィグのロード、DRAMメモリのクリア 
reload

不思議な所
ip filterでdenyしているにもかかわらずnatテーブルができてしまう。もしかして、filterを通過しているのかと思ったけどちゃんとパケットは落とされている。謎。

いけてないところ
WAN側のIFはISPからDHCPでIPが振られているのだが、そのリース期限は6時間。
6時間毎にIFがIPをリリースし、一度downしてしまう。よって、NAPTテーブルも全部クリアされてしまう。再度割り当てられるIPは同じIPなので、とても不便。

すばらしい安定性
1ヶ月運用しているが、一度も再起動しないで稼働している。

変更履歴
2010/2/23 DHCPのフィルタ削除。
以下、削除部分。

ip access-list weak-block deny tcp src any sport any dest any dport eq 67
ip access-list weak-block deny udp src any sport any dest any dport eq 67
ip access-list weak-block deny tcp src any sport any dest any dport eq 68
ip access-list weak-block deny udp src any sport any dest any dport eq 68