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Example: transparent proxy

r1: 

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hostname r1
buggy
!
logging file debug ../binTmp/zzz53r1-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface serial1
 no description
 encapsulation hdlc
 vrf forwarding v1
 ipv4 address 1.1.1.1 255.255.255.0
 ipv6 address 1234::1 ffff::
 no shutdown
 no log-link-change
 exit
!
proxy-profile p1
 vrf v1
 exit
!
!
!
!
!
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!
ipv4 route v1 0.0.0.0 0.0.0.0 1.1.1.2
!
ipv6 route v1 :: :: 1234::2
!
!
!
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server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end

r2: 

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hostname r2
buggy
!
logging file debug ../binTmp/zzz53r2-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface serial1
 no description
 encapsulation hdlc
 transproxy p1
 no shutdown
 no log-link-change
 exit
!
interface serial2
 no description
 encapsulation hdlc
 vrf forwarding v1
 ipv4 address 2.2.2.2 255.255.255.0
 ipv6 address 4321::2 ffff::
 no shutdown
 no log-link-change
 exit
!
proxy-profile p1
 vrf v1
 exit
!
!
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!
server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end

r3: 

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hostname r3
buggy
!
logging file debug ../binTmp/zzz53r3-log.run
!
vrf definition tester
 exit
!
vrf definition v1
 rd 1:1
 exit
!
interface loopback0
 no description
 vrf forwarding v1
 ipv4 address 3.3.3.3 255.255.255.255
 ipv6 address 3333::3 ffff::
 no shutdown
 no log-link-change
 exit
!
interface serial1
 no description
 encapsulation hdlc
 vrf forwarding v1
 ipv4 address 2.2.2.3 255.255.255.0
 ipv6 address 4321::3 ffff::
 no shutdown
 no log-link-change
 exit
!
!
!
!
!
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server telnet telnet
 no exec authorization
 no login authentication
 vrf v1
 exit
!
server telnet tester
 security protocol telnet
 no exec authorization
 no login authentication
 vrf tester
 exit
!
!
end


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r2#
r2#
r2#show transprox ser1
r2#show transprox ser1
 |~~~~~|~~~~~|~~~~~|~~~~~~|
 | prt | src | trg | idle |
 |-----|-----|-----|------|
 |_____|_____|_____|______|
r2#
r2#