Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

ggarza_345867's avatar
ggarza_345867
Icon for Nimbostratus rankNimbostratus
Jul 20, 2018

iRule is giving bracket errors but cant find it were.

iRule is giving bracket errors but cant find it were.   ! when DNS_REQUEST { switch [IP::remote_addr] { "192.168.163.0/24 “ { if { [LB::status vs 192.168.163.39] eq "up" } {   ...
application delivery
BIG-IP DNS
irules
Samir_Jha_52506's avatar
Samir_Jha_52506
Icon for Noctilucent rankNoctilucent
Jul 20, 2018

Written iRule with help of if & elseif condition. Please check & let us know if any confusion.

   when DNS_REQUEST { 
    if { [IP::addr [IP::remote_addr] equals 192.168.163.0 mask 255.255.255.0]} {
        if {[LB::status vs 192.168.163.39 ] eq "up" } {
                host 192.168.163.39 } 
        else { 
            host 192.168.204.45 }
    elseif { [IP::addr [IP::remote_addr] equals 192.168.165.0 mask 255.255.255.0]} {
        if {[LB::status vs 192.168.163.39] eq "up" } { 
            host 192.168.163.39 }
        else { 
            host 192.168.204.45 }
    elseif { [IP::addr [IP::remote_addr] equals 192.168.204.0 mask 255.255.255.0]} { 
                    if { [LB::status vs 192.168.204.45] eq "up" } { 
            host 192.168.204.45 } 
        else { 
            host 192.168.163.39 }
                }
        }
        }

hope it will help

ggarza_345867's avatar
ggarza_345867
Icon for Nimbostratus rankNimbostratus
Jul 24, 2018

Nope..still failing the iRule editor. I was getting some closed bracket errors, I added couple more at end to clear up. But now getting "invalid list element in quotes followed by "up" instead of space