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1
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2
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=================================================================================
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3
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Access-list case with no explict "deny any" on end of access-list "CONNECT" - bad
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4
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=================================================================================
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5
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6
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## firewall B partial config
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7
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router ospf
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8
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ospf router-id 192.168.24.1
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9
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log-adjacency-changes detail
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10
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auto-cost reference-bandwidth 40000
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11
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timers throttle spf 200 1000 10000
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12
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redistribute connected metric 20 route-map CONNECT
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13
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passive-interface em1
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14
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area 0.0.0.0 authentication message-digest
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15
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!
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16
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access-list CONNECT seq 10 permit 10.24.194.0/24
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17
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!
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18
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route-map CONNECT permit 10
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19
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match ip address CONNECT
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20
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!
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21
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22
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23
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## OSPF routes showing on adjacent firewall A
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24
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somefirewall.somedomain.local# show ip route ospf
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25
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Codes: K - kernel route, C - connected, S - static, R - RIP,
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26
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O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
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27
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T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
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28
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F - PBR, f - OpenFabric,
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29
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> - selected route, * - FIB route, q - queued, r - rejected, b - backup
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30
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31
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O>* 10.24.10.0/24 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06
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32
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O>* 10.24.194.0/24 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### Allowed in redistribute ACL. This is fine.
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33
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O>* 10.24.224.0/29 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### Connected route on firewall B not in OSPF or being redistributed. Should not appear!
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34
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O 10.254.40.0/28 [110/4] is directly connected, em0.40, weight 1, 00:13:23 ### This is fine (firewall A LAN1)
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35
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O 10.254.100.0/24 [110/4] is directly connected, em0.100, weight 1, 00:13:23 ### This is fine (firewall A LAN2)
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36
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O>* 10.255.195.1/32 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### VPN tunnel IPs. Don't want to be seeing it
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37
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O>* 10.255.196.1/32 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### VPN tunnel IPs. Don't want to be seeing it
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38
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O>* 10.255.198.2/32 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### VPN tunnel IPs. Don't want to be seeing it
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39
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O>* 103.XXX.XXX.1/32 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### firewall B's WAN2 route (PPP) - should not appear!
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40
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O>* 192.168.24.0/24 [110/8004] via 10.255.195.2, ovpns2 onlink, weight 1, 00:13:23 ### This is fine (firewall B LAN)
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41
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O 192.168.57.0/24 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### firewall B's lab connectivity - should not appear!
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42
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O>* 194.XXX.XXX.28/30 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:06 ### firewall B's WAN1 route - should not appear!!
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43
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44
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45
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46
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47
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48
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================================================================================
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49
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Access-list case with explicit "deny any" on end of access-list "CONNECT" - fine
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50
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================================================================================
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51
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52
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## firewall B partial config
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53
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router ospf
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54
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ospf router-id 192.168.24.1
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55
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log-adjacency-changes detail
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56
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auto-cost reference-bandwidth 40000
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57
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timers throttle spf 200 1000 10000
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58
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redistribute connected metric 20 route-map CONNECT
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59
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passive-interface em1
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60
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area 0.0.0.0 authentication message-digest
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61
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!
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62
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access-list CONNECT seq 10 permit 10.24.194.0/24
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63
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access-list CONNECT seq 20 deny any ### note the addition of an explicit "deny any". Shouldn't need this. ACL should implicit deny at the end.
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64
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!
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65
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route-map CONNECT permit 10
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66
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match ip address CONNECT
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67
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!
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68
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69
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70
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## OSPF routes showing on adjacent firewall A
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71
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somefirewall.somedomain.local# show ip route ospf
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72
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Codes: K - kernel route, C - connected, S - static, R - RIP,
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73
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O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
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74
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T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
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75
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F - PBR, f - OpenFabric,
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76
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> - selected route, * - FIB route, q - queued, r - rejected, b - backup
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77
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78
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O>* 10.24.194.0/24 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:22
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79
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O 10.254.40.0/28 [110/4] is directly connected, em0.40, weight 1, 00:22:18
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80
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O 10.254.100.0/24 [110/4] is directly connected, em0.100, weight 1, 00:22:18
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81
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O>* 192.168.24.0/24 [110/8004] via 10.255.195.2, ovpns2 onlink, weight 1, 00:00:46
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82
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83
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84
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85
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86
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87
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===================================================================================
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88
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Prefix-list case with no explicit "deny any" on end of prefix-list "CONNECT" - fine
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89
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===================================================================================
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90
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91
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## firewall B partial config
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92
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router ospf
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93
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ospf router-id 192.168.24.1
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94
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log-adjacency-changes detail
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95
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auto-cost reference-bandwidth 40000
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96
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timers throttle spf 200 1000 10000
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97
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redistribute connected metric 20 route-map CONNECT
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98
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passive-interface em1
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99
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area 0.0.0.0 authentication message-digest
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100
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!
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101
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ip prefix-list CONNECT seq 10 permit 10.24.194.0/24
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102
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!
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103
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route-map CONNECT permit 10
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104
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match ip address prefix-list CONNECT
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105
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!
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106
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|
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107
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108
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## OSPF routes showing on adjacent firewall A
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109
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somefirewall.somedomain.local# show ip route ospf
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110
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Codes: K - kernel route, C - connected, S - static, R - RIP,
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111
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O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
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112
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T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
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113
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F - PBR, f - OpenFabric,
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114
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> - selected route, * - FIB route, q - queued, r - rejected, b - backup
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115
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|
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116
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O>* 10.24.194.0/24 [110/20] via 10.255.195.2, ovpns2 onlink, weight 1, 00:01:53
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117
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O 10.254.40.0/28 [110/4] is directly connected, em0.40, weight 1, 00:43:50
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118
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O 10.254.100.0/24 [110/4] is directly connected, em0.100, weight 1, 00:43:50
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119
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O>* 192.168.24.0/24 [110/8004] via 10.255.195.2, ovpns2 onlink, weight 1, 00:02:34
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120
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