AWSリージョン間接続 BGP
VyOS でリージョン間のVPNを構築。
単一構成であればスタティックルートで良いですが、冗長構成も考えBGPの構成を実装。
構成図
ルーティング
- 拠点間をeBGPにてピア接続を行う
- Front SubnetのネットワークはStatic経路をBGPに再配布することによって経路公告を行う
- BGPTimerは[Hello:4秒][Dead:12秒]とし検知12秒 切替1秒
(短くしすぎたらピアDownが頻発したのでこのぐらいがちょうどいいかと) - Routemapを付与しない場合バグが発生したので設定している
- MTUは1414
- IPSec/GREでトンネルを構築
AWS設定
- AmazonLinux 最新版のAMI
- →RoutingTableに「対向のネットワーク：VyOSのENI」を設定する
- VyOS コミュニティAMIの最新版(Version 1.1.0)
- →source dest checkを無効にする
- →EIPを付与する
- セキュリティグループ
- →対向のEIP宛の通信を許可しておく
Config
set system host-name [hostname] set vpn ipsec ipsec-interfaces interface [if:eth0] set vpn ipsec ike-group ike lifetime 3600 set vpn ipsec ike-group ike proposal 1 encryption aes128 set vpn ipsec ike-group ike proposal 1 hash sha1 set vpn ipsec esp-group esp lifetime 1800 set vpn ipsec esp-group esp proposal 1 encryption aes128 set vpn ipsec esp-group esp proposal 1 hash sha1 set vpn ipsec site-to-site peer [対向EIP] authentication mode pre-shared-secret set vpn ipsec site-to-site peer [対向EIP] authentication pre-shared-secret [パスワード文字列] set vpn ipsec site-to-site peer [対向EIP] authentication id [自身のID] set vpn ipsec site-to-site peer [対向EIP] authentication remote-id [対向のID] set vpn ipsec site-to-site peer [対向EIP] default-esp-group esp set vpn ipsec site-to-site peer [対向EIP] ike-group ike set vpn ipsec site-to-site peer [対向EIP] local-address [ローカルIP] set vpn ipsec site-to-site peer [対向EIP] tunnel 1 local prefix [LoopbackIP] set vpn ipsec site-to-site peer [対向EIP] tunnel 1 remote prefix [対向LoopbackIP] set interfaces loopback lo address [LoopbackIP] set interfaces tunnel tun0 address [VPN用アドレス/30] set interfaces tunnel tun0 local-ip [LoopbackIP] set interfaces tunnel tun0 remote-ip [対向LoopbackIP] set interfaces tunnel tun0 mtu 1414 set interfaces tunnel tun0 encapsulation gre set protocols bgp [自AS番号] neighbor [対向VPN用アドレス/30] remote-as 65001 set protocols bgp [自AS番号] neighbor [対向VPN用アドレス/30] soft-reconfiguration inbound set protocols bgp [自AS番号] neighbor [対向VPN用アドレス/30] update-source tun0 set protocols bgp [自AS番号] network [VPN用ネットワークアドレス/30] set protocols bgp [自AS番号] network [LoopbackIP] set protocols bgp [自AS番号] timers holdtime 12 set protocols bgp [自AS番号] timers keepalive 4 set protocols bgp [自AS番号] parameters log-neighbor-changes set policy prefix-list prefix-connect-to-bgp rule 10 action permit set policy prefix-list prefix-connect-to-bgp rule 10 prefix [VyOS Subnet] set policy route-map routemap-connect-to-bgp rule 1 action permit set policy route-map routemap-connect-to-bgp rule 1 match ip address prefix-list prefix-connect-to-bgp set protocols bgp [自AS番号] network [VyOS Subnet] route-map routemap-connect-to-bgp set policy prefix-list prefix-static-to-bgp rule 10 action permit set policy prefix-list prefix-static-to-bgp rule 10 prefix [Front Subnet] set policy route-map routemap-static-to-bgp rule 1 action permit set policy route-map routemap-static-to-bgp rule 1 match ip address prefix-list prefix-static-to-bgp set protocols bgp [自AS番号] redistribute static route-map routemap-static-to-bgp set protocols static route [Front Subnet] next-hop [AWS DefaultGW]
etc…
今回は冗長構成を踏まえた設定となるため、冗長構成パターンは別途記載予定。
元記事はこちらです。
「AWSでのリージョン間接続 その2 BGP単一構成パターン(VPN/VyOS)」
