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作者jcli.bbs@ptt.cc (Sincerely Yours.) 看板: linux
標題[問題] DHCP Relay agent information 問題
時間批踢踢實業 (2008/05/19 Mon 10:04:38)
Dear Sirs,
我的 DHCP server 透過了一台有
L2 DHCP snooping with relay agent information ( option 82 ) 的設備 (switch),
接入我的 client 端;

依據接入 port 的 PVID 不同,會在 client 封包中安插入不同的 agent information,
但是因不為 L3 設備,因此 giaddr 不會寫入,僅新增 option 82 欄位提供給
DHCP server 分配 ip 之用。

在 class = "vlan1" 的情況下,( agent.circuit-id=1 ) client 端能夠正常的取得 ip,
1/2 lease time 的 request 也都正常,server 有正常回應 ack。

但在 class != "vlan1" (eg. vlan2 ) 的情況下,( agent.circuit-id!=1 )
client 第一次透過 discovery 取得 ip 之後,不論是 1/2, 3/4, 還是 7/8 的
lease time 都無法透過 request 繼續更新,直到 lease time 完全用完,
重新 discovery。

此時 client 端和 server 端安裝 wireshark/ethereal 監看,client 有發出 request
封包,server 也有收到 request,但是 server 就是沒有發出相對應的回應 ack。

我用的是 ISC dhcpd-3.0.7 版本,client 用的是 windows xp sp2,
以下是我的 /etc/dhcpd config 檔,不知道各位先進有什麼看法,
還是說設定檔有誤,感謝回應。

--
log-facility local6;
ddns-update-style       none;
default-lease-time      180;
max-lease-time  600;

shared-network subnet100{

class "vlan100" {
        match if binary-to-ascii (10, 16, "", substring( option
agent.circuit-id, 2, 2)) = "100" ;}

class "vlan200" {
        match if binary-to-ascii (10, 16, "", substring( option
agent.circuit-id, 2, 2)) = "200" ;}

class "vlan1" {
        match if binary-to-ascii (10, 16, "", substring( option
agent.circuit-id, 2, 2)) = "1" ;}

class "vlan2" {
        match if binary-to-ascii (10, 16, "", substring( option
agent.circuit-id, 2, 2)) = "2" ;}

class "vlan4094" {
        match if binary-to-ascii (10, 16, "", substring( option
agent.circuit-id, 2, 2)) = "4094" ;}

subnet 192.168.3.0 netmask 255.255.255.0 {
        pool {
                allow members of "vlan100";
                range 192.168.3.20 192.168.3.22;
                option subnet-mask 255.255.255.0;
                option nis-domain       "vlan100";
                option domain-name      "vlan100";
                option routers 192.168.3.253;
        }
}

subnet 192.168.3.0 netmask 255.255.255.0 {
        pool {
                allow members of "vlan200";
                range 192.168.3.23 192.168.3.25;
                option subnet-mask 255.255.255.0;
                option nis-domain       "vlan200";
                option domain-name      "vlan200";
                option routers 192.168.3.253;
        }
}

subnet 192.168.3.0 netmask 255.255.255.0 {
        pool {
                allow members of "vlan2";
                range 192.168.3.26 192.168.3.28;
                option subnet-mask 255.255.255.0;
                option nis-domain       "vlan1";
                option domain-name      "vlan1";
                option routers 192.168.3.253;
        }
}

subnet 192.168.3.0 netmask 255.255.255.0 {
        pool {
                allow members of "vlan1";
                range 192.168.3.29 192.168.3.31;
                option subnet-mask 255.255.255.0;
                option nis-domain       "vlan1";
                option domain-name      "vlan1";
                option routers 192.168.3.253;
        }
}

subnet 192.168.3.0 netmask 255.255.255.0 {
        pool {
                allow members of "vlan4094";
                range 192.168.3.32 192.168.3.34;
                option subnet-mask 255.255.255.0;
                option domain-name      "vlan4094";
                option routers 192.168.3.253;
        }
}

#subnet 192.168.3.0 netmask 255.255.255.0 {
#        pool {
#                range 192.168.3.13 192.168.3.15;
#                option subnet-mask 255.255.255.0;
#                option nis-domain      "novlan";
#                option domain-name     "novlan";
#                option routers 192.168.3.253;
#        }
#}

}


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